Modern feminine variant of Finley, an Irish-Scottish name meaning 'fair-haired warrior.'
Finnleigh is a warmly inventive respelling of Finley — itself an Anglicization of the Scottish and Irish Gaelic name Fionnlagh, meaning "fair warrior" or "white champion." The root "fionn" (fair, bright, white) permeates Celtic myth most famously through Fionn mac Cumhaill, the legendary Irish hero-hunter whose name literally means "the fair one." Fionn commanded the Fianna, an elite band of warriors, and his exploits — including eating the Salmon of Knowledge and gaining all the world's wisdom — made him one of the great figures of early Irish literature.
The name crossed into Scotland as Finlay and into English records as Findlay and Finley, carried by clan chiefs and minor royalty across the medieval Highlands. In the 19th and early 20th centuries it settled primarily as a surname — the playwright and screenwriter Finlay Currie is one notable bearer — before the surname-as-forename trend of the 1990s and 2000s revived it warmly as a given name for children of all genders. The Finnleigh spelling, with its doubled consonant and softer "-leigh" ending, brings a distinctly modern, feminine softness to what was historically a masculine warrior name.
The "-leigh" suffix (from Old English "lēah," a woodland clearing) is a popular stylistic flourish that parents use to lend names a pastoral, almost storybook quality. Finnleigh therefore wears its Celtic heroic bones lightly, feeling at once ancient in heritage and entirely contemporary in sensibility.