Killian \k(il)-lian\ as a boy's name is pronounced KIL-ee-an. It is of Irish and Gaelic origin, and the meaning of Killian is "bright-headed". From the same root as Kelly. The name is popular in France.

Killian has 3 variant forms: Kilean, Kilian and Killean.

For more information, see also the related name Cillian.

Baby names that sound like Killian are Gillian, Gillean, Gillion, Gillan, Gilian, Keillan, Kellin and Kellan.