Tiarnan is an Irish given name of obscure origin, often believed to mean "little dark one" in Gaelic. It is a rare and unique name, typically found among the Irish population, but also appearing occasionally in other parts of the world where there is an Irish influence or interest in Celtic culture. The name Tiarnan has not traditionally been associated with any specific day on the calendar as it is not derived from saint's names or historical figures. It is predominantly used for boys, though its unusual nature makes it suitable for individuals who wish to stand out and embrace their unique identity.
"Tiarnan saw a peak in popularity with 8 births in 2002, but overall has seen a steady decline from its highest point of 7 births in 1998."