The name Kilian is a boy’s name with German and Irish origins. Kilian is a German variation on the Irish name, Cilian. In German, their spelling means “church” whereas the Irish name means to be “bright-headed”. This is a great name for those with either Germanic or Irish roots who intend on paying homage to their heritage. Kilian is also a popular name all throughout Europe including in Spain, France, Austria, and Switzerland.