From Irish Gaelic Ó Cearbhalláin meaning 'descendant of the little champion'; also an English surname.
Carlin traces its roots to the Gaelic Ó Cairealláin, a clan name from the northwest of Ireland, though it also carries a parallel lineage as a diminutive of the Germanic Charles — itself derived from the Old High German karl, meaning 'free man' or 'man of the people.' This dual etymology gives Carlin an unusually democratic energy: it is simultaneously aristocratic in its Carolingian associations and earthy in its Gaelic origins.
For centuries Carlin remained a quiet surname across Ireland and the Scottish Highlands before drifting into given-name use in the English-speaking world. Its most resonant modern bearer is George Carlin, the American comedian and social critic whose relentless interrogation of language and power gave the name an irreverent, intellectual sheen. That association has made Carlin attractive to parents who want something with Celtic warmth but a subversive edge.
Today Carlin occupies a comfortable position as a gender-fluid choice — neither aggressively masculine nor self-consciously feminine — which suits contemporary naming sensibilities well. Its soft landing on the second syllable gives it a lyrical quality that distinguishes it from its harder-edged cousin Carl, and its rarity ensures it will feel fresh for another generation.