Origin of the name Kieran: A borrowing from the Irish, Kieran is the Irish form of the Gaelic Ciarán (little dark one), which is from ciar (black, dark), a word meaning "dark-haired" or "black-haired" when applied to humans.
Tierney Name Meaning. Irish: reduced form of O'Tierney, an Anglicized form of Gaelic Ó Tíghearnaigh 'descendant of Tighearnach', a byname meaning 'lord', 'master'. The Gaelic name is sometimes 'translated' as English Lord.
