The name Ciaran is a boy's name of Irish origin meaning "little dark one". Ciaran and is often added to lists like Boy Names Uncommon in the US and discussed in our forums with posts like "Pick 5 (BOYS)".
From the experts:
Extremely popular in Ireland, Ciaran is also well used in England and is beginning to be adopted by parents in the U.S., though usually via the more American-friendly Kieran spelling. The Irish spelling is, however, becoming more familiar on this side of the Atlantic, due to the rising popularity of Belfast-born actor Ciaran Hinds.
Although it was the name of twenty-six saints in Ireland, Ciaran was not used as a secular name there until the 1950s.