| Gaelic name | Clann Loganaich (associated form) |
| Meaning | From Old Gaelic lag (hollow, little dell) + diminutive suffix — 'little hollow' |
| Motto | Hoc majorum virtus (This is the virtue of my ancestors) |
| Core territory | Ayrshire, Berwickshire, and later Ross-shire |
| Chief | Logan of Logan |
Logan is a place-name surname — the family took their name from a place called Logan, derived from the Gaelic lag (hollow, small valley) with a diminutive suffix, meaning "little hollow." There are multiple places called Logan in Scotland, but the principal origin is in Ayrshire, where the family held lands from the medieval period.
As a surname, Logan is ancient in Scotland. The Logans appear in Berwickshire records in the 13th century, and in Ayrshire (their main homeland) from the medieval period. A separate northern branch of the Logan name emerged in Ross-shire, creating two distinct regional concentrations.
The Logan homeland in the south was centered on Logan in Ayrshire — the "little hollow" of the name, a landscape of rolling Ayrshire farmland and coastal plain. The family also had connections to Berwickshire in the eastern Borders. A northern strand of the Logan name is found in Ross-shire in the Highlands, associated with a separate family tradition that may share the surname while having distinct origins.
The Logans appear in the early medieval records of Scotland as minor nobility with connections to the Ayrshire region. The most notable historical figure of the early Logan family was Sir Robert Logan of Restalrig, who was implicated in the Gowrie Conspiracy of 1600 — the mysterious plot against James VI (James I of England) in which the Earl of Gowrie and his brother were killed. Logan of Restalrig died before the plot's exposure, and his estates were forfeited posthumously — his body was exhumed and tried for treason, one of the stranger episodes in Scottish legal history.
The Logan name is now best known internationally through its use as both a surname and a given name in the English-speaking world. The given name Logan has become extremely popular in North America in the 21st century — one of the clearest examples of a Scottish surname becoming a forename across the diaspora.
Logan is widespread across the Scottish diaspora. The name's clear, easily pronounced form made it one of the more stable Scottish surnames through immigration — it was unlikely to be misspelled or altered at American immigration processing. It is common in Canada, the United States, Australia, and New Zealand.
Logan City in Queensland, Australia — a significant population center south of Brisbane — was named for a Scottish-born colonial officer, reflecting how Scottish surnames marked the landscape of the British colonies.
For Ayrshire branches, the Ayrshire Archives in Ayr hold relevant local records. For Ross-shire branches, the Highland Archive Centre in Inverness is the starting point. ScotlandsPeople.gov.uk provides national coverage of Scottish registers. The surname's relative clarity and consistency in spelling makes it one of the easier Scottish names to trace through immigration records.
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