Long popular in Ireland and England, Kieran, the name of Ireland's first-born saint and twenty-five other saints, has been building its U.S. fan base thanks to its strong and attractive sound, and its fashionable Irish brogue. While Ciaran is the more authentic Irish spelling, Kieran is more popular this side of the Atlantic.

Kieran is a boys' name that could cross over, as an update of outmoded Karen or a variation on trendy Kiera (or Keira or Kyra). Keren Ann is an Israeli-born singer. The proportion of babies named Kieran who are girls is less than ten percent.