US Popularity Rank: 1213

Origin: Irish

Meaning: Bright-headed; Church; War, strife

For a name as promising and multi-faceted as baby's future, give Cillian a go. This Irish boy's name means "bright-headed." This name could also mean "monastery, church," as cill is the Irish word for church, letting you give a nod to your faith if you want. Cillian might mean "war strife," so it's perfect if your son throws spirited tantrums. This traditional name has skyrocketed in popularity since the noughties, which may well be due to actor Cillian Murphy's performances in 28 Days Later, Batman Begins, and The Dark Knight Rises.