| Core territory | Perthshire, Stirlingshire, Argyll, and widespread |
| Gaelic form | Mac Fionnlaigh |
| Notable figures | Carlos Juan Finlay (Cuban physician of Scottish descent), Findlay Ohio |
Finlay — also spelled Findlay, Finley, or Finly — derives from the Gaelic personal name Fionnlagh, meaning "fair warrior" or "white hero" (from fionn, white or fair, and laogh, warrior or hero). It is one of the oldest personal names in the Gaelic tradition and appears in the earliest layers of Scottish naming history.
The name was extremely common as a given name in medieval Scotland: Findlaech was the name of Macbeth's father (King Macbeth of Shakespeare's play was the historical Macbeth mac Findlaech, who ruled Scotland 1040–1057). From the given name, the surname was derived in the usual Gaelic pattern: Mac Fionnlaigh, meaning "son of Fionnlagh." When surnames were fixed in the 16th and 17th centuries, families using this patronymic adopted Finlay, Findlay, or Finley as their permanent surnames.
Finlay is found throughout Scotland but is concentrated in Perthshire, Stirlingshire, and Argyll — the heartland of the Gaelic-speaking Highlands — as well as in the Lowlands where Highland emigrants settled in the 18th and 19th centuries. In the United States, the spelling "Finley" is common among Scots-Irish emigrants from Ulster, who had originally come from Scotland.
The town of Findlay, Ohio — named for Colonel James Findlay of the War of 1812 — is one of the most visible markers of the Finlay diaspora in North America. Colonel Findlay was of Scottish descent, and his name attached itself to a significant Ohio city in the early republic.
Carlos Juan Finlay (1833–1915) was a Cuban-born physician of Scottish-French descent — his father was Edward Finlay, a Scottish physician who settled in Cuba in the 1830s. Carlos Juan Finlay is credited with identifying the mosquito as the carrier of yellow fever, a discovery that predated Walter Reed's famous experiments by two decades. His work — initially dismissed, then vindicated — is now considered one of the foundational contributions to tropical medicine. Cuba honoured him on its currency; his birthday is marked as Cuban Public Health Day.
The variety of spellings — Finlay, Findlay, Finley, Finely, Finlayson — means that a broad search across variant spellings is essential when researching this family name. Finlayson (son of Finlay) is a related patronymic that appears particularly in the northern Highlands.
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