Killian is a masculine name of Irish origin that is rich with meaning. A variant spelling of Cillian, this name comes from the Celtic word ceallach, and translates to “bright-headed” and “little warrior.” This makes Killian a wonderful choice to help baby embrace their strong spirit and beautiful mind. Killian also comes from the Irish word cill, which means “church,” giving you and baby a unique way to celebrate your faith together.