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Cillian

The name Cillian peaked for girls at #13797 in 2024. Cillian is also used for boys, ranking #507 in 2025.

The name Cillian is a boy's name of Irish origin meaning "war strife or church".

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Cillian is one of the native Irish names that, along with Aiden and Declan, is becoming an unlikely favorite in contemporary America. The Killian spelling has been more popular in the US, but Cillian's star is rising, perhaps thanks to Irish actor Cillian Murphy, star of Oppenheimer and Peaky Blinders.
 There are several Saint Cillians, including one who was sent to Bavaria to convert the natives and was martyred for his trouble. 
 Patrick Woulfe, a Catholic priest who was instrumental in reviving native Irish names in that country after the war for independence from England in the 1920s, theorized that Cillian might also be related to a Gaelic name meaning war.

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The name Cillian is currently ranked #507 in U.S. births. and peaked for boys at #463 in 2024. The name is most popular in Alaska, Alaska, and Massachusetts. Cillian is occasionally used for girls in 2024.

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