The first name Kieran is of Scottish, Irish, Gaelic, Celtic, Celtic/Gaelic origin. It is often a boy or girl name. It has the following meaning(s):
Scottish: Balck-haired; a Borrowing from the Irish, Kieran is the Irish Form of the Gaelic Ciaran (Little Dark One), Which is from Ciar (Black, Dark), a Word Meaning 'Dark-haired' or 'Black-haired' When Applied
Irish: Black or Dark
Gaelic: Black
Celtic: Dark Skinned
Gaelic: Little and Dark Skinned; an Irish Saint Who Christianized Southern Ireland. (Kiernan). Origin: Gaelic
Ciaran(Gaelic) Dark-haired. Anglicized to Kieran (They are Pronounced the Same Way). Ciara/Kiera for Girls (Pronounced As Kieran But Without the Final 'N'). Origin: Gaelic