Scottish Surnames of Clan MacLachlan: Origins, Tartans, and Clan History

Clan MacLachlan is one of Scotland’s oldest and most ancient Highland clans. The clan has called Argyll home for nearly 800 years. If your family name is MacLachlan, McLachlan, McLaughlin, or any of its many variants, your Scottish roots likely stretch back to the shores of Loch Fyne in the west of Scotland.

This guide covers everything you need to know about Clan MacLachlan — from its origins in 13th-century Argyll to its tartans, motto, castle, and the turbulent history that shaped the clan across the centuries. If you are tracing your MacLachlan ancestry, you will also find practical tips for getting started.

Who Are the MacLachlans of Scotland?

The MacLachlan name comes from the Gaelic Mac Lachlainn, meaning “son of Lachlan.” The founding figure of the clan was Lachlan Mòr — “Lachlan the Great” — who lived in the 13th century. He was a powerful chieftain in Argyll, and the clan bears his name to this day.

The first recorded mention of the clan comes from 1246, when Gillescop MacLachlan witnessed a charter for the Bishop of Argyll. That document is nearly 800 years old. Few Scottish clans can trace their documented history back that far.

The clan belongs to the Argyll kindred — the ancient families of western Scotland who dominated the sea roads and sea lochs of the Inner Hebrides and the Firth of Clyde. They shared this region with the Campbells, the MacNeils, the MacDougalls, and other great Argyll clans.

The Clan Lands: Strathlachlan and Loch Fyne

The heartland of Clan MacLachlan sits on the eastern shore of Loch Fyne in mid-Argyll. The area is called Strathlachlan — “the valley of the MacLachlans” — and it remains linked to the clan name to this day.

Loch Fyne is one of Scotland’s longest sea lochs. It stretches from Inveraray in the north down towards the Kintyre peninsula in the south. The MacLachlan lands occupied the eastern shore between the village of Strachur and the head of the loch.

This part of Argyll is quiet and stunning. The loch reflects the wooded hillsides, and the roads that wind along the shore still feel remote even today. If you visit, you are walking the same landscape that shaped the MacLachlan clan for centuries.

If you are planning a trip to this part of Scotland, the town of Oban makes an excellent base. From Oban, you can explore Argyll’s sea lochs, coastlines, and ancient clan territories with ease.

Castle Lachlan: The Ancient Stronghold of the Clan

Old Castle Lachlan stands in ruins on a rocky promontory beside Loch Fyne. The tower house dates to the 15th century, though the site may have been fortified much earlier. It is a typical Scottish tower house — square, solidly built, and designed to defend the clan’s lands against rival families.

The castle saw its most dramatic moment in 1746. After the Battle of Culloden, a Royal Navy warship sailed into Loch Fyne and bombarded Castle Lachlan. The bombardment left the castle in the ruined state you can see today. The story of why a warship targeted a small Argyll tower house takes us back to the Jacobite Rising — which we cover in the next section.

Today, New Castle Lachlan — also called Strathlachlan Castle — stands nearby. It is an 18th-century Georgian mansion built after the old tower was destroyed. The current chief of Clan MacLachlan lives there, and the castle remains in the hands of the MacLachlan family.

The ruins of Old Castle Lachlan are accessible on foot from the road that runs along the eastern shore of Loch Fyne. They are not a major tourist attraction, which means you will likely have the place to yourself — a rare gift in Scotland during the summer months.

Clan MacLachlan Through the Ages

The MacLachlans played an active role in Scottish history from the moment they appeared in the historical record.

The Wars of Scottish Independence

During the Wars of Scottish Independence in the late 13th and early 14th centuries, the MacLachlans supported Robert the Bruce. The clan chief at the time backed Bruce’s campaign to secure the Scottish throne, and that alliance tied the MacLachlans to one of the most important periods in Scottish history.

Robert the Bruce eventually became King of Scots after his victory at the Battle of Bannockburn in 1314. The clans who supported him gained prestige and standing. For the MacLachlans, supporting Bruce helped cement their position in Argyll.

Relations With the Campbells

The MacLachlans and the Campbells occupied neighbouring lands in Argyll for centuries. Inveraray — the ancestral seat of the Duke of Argyll and the Campbell clan — sits just a few miles from Strathlachlan on the opposite shore of Loch Fyne.

Relations between the two clans were sometimes cooperative and sometimes tense, as was the case for most neighbouring Argyll families. The MacLachlans were never as powerful as the Campbells, but they maintained their independence and their lands across the centuries.

The Jacobite Rising and the Clan’s Greatest Test

The Jacobite Risings of the 18th century tested the loyalty and survival of dozens of Scottish clans. The MacLachlans made a fateful choice: they sided with the Stuarts.

In 1715, during the first major Jacobite Rising, the MacLachlan chief led his men to fight at the Battle of Sheriffmuir on the Jacobite side. The battle ended inconclusively, and the Rising ultimately failed.

Thirty years later, in 1745, Bonnie Prince Charlie raised the Jacobite standard again. Donald MacLachlan of MacLachlan — the 17th chief of the clan — answered the call. He led the MacLachlan men to join the Prince’s army as it marched south.

Donald MacLachlan died at the Battle of Culloden on 16 April 1746. He was one of hundreds of Jacobite officers killed that day on Drumossie Moor near Inverness. The battle lasted less than an hour. It ended the Jacobite cause forever.

The aftermath of Culloden was brutal for all Jacobite clans. If you visit Culloden Battlefield today, you can walk the ground where Donald MacLachlan fell. The clan’s name appears on the memorial stones alongside dozens of other Highland families who paid the ultimate price for their loyalty to the Stuart cause.

The destruction of Castle Lachlan came as direct retribution. A Royal Navy vessel bombarded the MacLachlan seat from the water, leaving the tower house in ruins. The Highland clearances and the restrictions placed on Highland culture after Culloden hit Argyll clans hard. Many MacLachlans left Scotland in the decades that followed — part of the great diaspora that spread Scottish families across the world.

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Clan MacLachlan Tartans and Symbols

Clan MacLachlan has its own registered tartan. The principal MacLachlan tartan features a hunting pattern in shades of green, navy blue, and black — colours that blend naturally with the Argyll landscape. There is also a dress tartan in lighter colours for more formal occasions.

The MacLachlan Clan Motto

The clan motto is Fortis et fidus — Latin for “Strong and faithful.” Those three words say a great deal about how the MacLachlans saw themselves across the centuries. Their loyalty to the Jacobite cause — even at Culloden, even at the cost of their chief’s life and their castle’s destruction — is one of the most striking examples of that motto in action.

The Clan Crest and Badge

The MacLachlan clan crest shows a castle with a rowan tree growing beside it. The rowan has been a symbol of protection in Scottish and Celtic tradition for thousands of years. Highland families planted rowans near their homes to guard against harm.

The clan badge is the rowan tree — or caorann in Scottish Gaelic. Clan members traditionally wore a sprig of rowan in their bonnets as a sign of allegiance.

MacLachlan Surname Variants: Is This Your Name?

The MacLachlan name has spread around the world in many spellings. Gaelic surnames changed as they passed through English official records in Scotland, Ireland, Canada, Australia, and the United States. Sometimes the change was dramatic.

Common variants of the MacLachlan surname include:

• MacLachlan — the traditional Scots Gaelic spelling
• McLachlan — common in Australia and Canada
• McLaughlin — widespread in the United States and Ireland
• McLaughlan — found in Scotland, Canada, and the USA
• McClocklin — a rarer phonetic variant
• Lachlan — sometimes used as a standalone surname

Note that McLaughlin is also an Irish surname. The Irish Ó Lochlainn clan and the Scottish MacLachlan clan are distinct families, though they share a common Gaelic root word meaning “land of the fjords” (a reference to Scandinavia). If your family is from Ireland and your name is McLaughlin, your roots may be Irish rather than Scottish — though DNA testing can help you distinguish between the two.

Famous MacLachlans Around the World

The MacLachlan diaspora spread across the English-speaking world, and the name appears in some unexpected places.

Lachlan Macquarie (1762–1824) was a Scottish soldier and colonial governor of New South Wales in Australia. He shaped the early colony and is often called “the Father of Australia.” He was born in Ulva, a small island off the Isle of Mull in the Inner Hebrides — not far from the MacLachlan heartland in Argyll.

John McLaughlin is a legendary American guitarist and jazz musician. He was born in Doncaster, England, but his family name reflects Scottish heritage carried south across the generations.

The McLachlan name is widespread in Australia, where Scottish emigration brought many families during the 19th and early 20th centuries. Nova Scotia, Canada — whose very name means “New Scotland” — also has a strong MacLachlan presence.

Tracing Your MacLachlan Ancestry

If you carry one of the MacLachlan surname variants and want to trace your family back to Scotland, Argyll is the place to start. Here are the most useful resources.

ScotlandsPeople

ScotlandsPeople (www.scotlandspeople.gov.uk) is the official Scottish government genealogy database. It holds over 100 million records including birth, marriage, and death registers from 1553 onwards. Search for MacLachlan, McLachlan, and their variants. Records from Argyll parishes — especially Strathlachlan and Strachur — are the most relevant for this clan.

The Clan MacLachlan Association

The Clan MacLachlan Association (www.clanmaclachlan.org) is the international membership organisation for the clan. It connects MacLachlans across the world, maintains clan records, and organises gatherings. Joining the association is a practical first step if you are seriously researching your MacLachlan ancestry.

DNA Testing

DNA tests from Ancestry DNA or 23andMe can place your family within Scottish genetic groupings. This helps if your name has changed so much it is hard to trace. Scottish Y-chromosome DNA studies have found genetic markers linked to the Argyll region. These can help confirm a MacLachlan connection.

For a full guide to researching your Scottish family tree, read our complete guide to tracing your Scottish ancestry.

Visiting MacLachlan Country: Argyll’s Loch Fyne Shore

If you want to see the MacLachlan homeland for yourself, the drive along the eastern shore of Loch Fyne is one of the most beautiful and peaceful routes in Scotland.

From Inveraray, take the A83 south and then turn onto the B8000 road that follows the loch shore through Strathlachlan. You will pass through the village of Strachur, and the ruins of Old Castle Lachlan are visible from the roadside near the settlement of Inver.

The drive takes you through wooded hillsides and farmland with views across the silver loch. It is the kind of Scotland that most visitors never see — quiet, unhurried, and deeply beautiful.

Frequently Asked Questions About Clan MacLachlan

Where did Clan MacLachlan originally come from?

Clan MacLachlan comes from Strathlachlan on the eastern shore of Loch Fyne in Argyll, western Scotland. The clan takes its name from Lachlan Mòr, a powerful 13th-century chieftain. The earliest written record of the clan dates to 1246, making it one of the oldest documented families in Scotland.

What is the MacLachlan clan motto?

The MacLachlan clan motto is Fortis et fidus, which is Latin for “Strong and faithful.” The motto reflects the clan’s loyalty throughout Scottish history, including its steadfast support for the Jacobite cause during the 18th-century Risings.

Was Clan MacLachlan at the Battle of Culloden?

Yes. Donald MacLachlan of MacLachlan, the 17th chief of the clan, was killed at the Battle of Culloden on 16 April 1746 while fighting for Bonnie Prince Charlie. As a consequence of the clan’s Jacobite loyalty, Castle Lachlan was bombarded by a Royal Navy vessel and destroyed. The ruins still stand near Loch Fyne today.

Is McLaughlin the same as MacLachlan?

McLaughlin can be either Scottish or Irish in origin. The Scottish MacLachlan clan anglicised their name to McLaughlin in many cases. However, the Irish Ó Lochlainn clan also produced the McLaughlin spelling independently. If your family is from Scotland, you are likely descended from Clan MacLachlan. If your family is from Ireland, the origin may be the Irish Ó Lochlainn family. DNA testing can help you determine which line is yours.