Kierran is a unisex given name of Irish origin, derived from the Irish surname Ó Ciardubháin. The name is believed to have been borne by an early Irish family who were known for their red hair, hence the derivation "red-haired." In modern times, Kierran has gained popularity as a given name, particularly in English-speaking countries. It is often spelled variations such as Kieran or Kiarn.
The name Kierran first appeared in the record of birth names in 2017 with five newborns bearing this unique moniker.