The name Killian is a girl's name meaning "war strife or church".

7 Letter Girl Names

Names Ending in N for Girls

Names That Mean War

Names That Mean Church

Names That Mean Strife

Three Syllable Names for Girls

Two Syllable Names for Girls

One-of-a-Kind Baby Names Stand Out

Best K Names for Boys

March Baby Names Let The Sunshine In!

Yes, another Irish surname, turned boys' name, turned unisex name. But we think this one has a bit more going for it than Logan or Mason, given its similarity in sound to very traditional <a href="https://nameberry.com/girls-names">feminine names</a> Gillian and Lillian. 

Surname Names for Girls

Irish Last Names (With Meanings and Popularity)

Boy Names for Girls

Killian

The name Killian peaked for girls at #3498 in 1997. Killian is also used for boys, ranking #418 in 2025.

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

Irish Names

Names Ending in -ian for Boys

Irish Names for Boys

7 Letter Boy Names

Names Ending in N for Boys

Names that Peaked in 2017

Two Syllable Names for Boys

Boy Dog Names That Start With K

Dog Names That Start With K

Irish Names that Start With K

Killian – aka Cillian – is a spirited yet resonant Gaelic name that was borne by several Irish saints and could make a distinctive replacement for the dated Kelly. Kylian is another spelling that's gaining traction, thanks to French soccer star Kylian Mbappé. Possible downsides: an unsavory first syllable and a connection to the trendy brew. 

Cool Baby Names for Girls and Boys

Kool K Baby Names 

Boy Names Like Finn

Catholic Baby Names (with Meanings and Popularity)

Cool Unique Saint Names for Babies

Cool Cat Names

Boy Names Like Dylan

November Baby Names

New Baby Boy Names

Names That Feel Exotic Yet Simple

Unisex Irish Names

Alternatives to Ryan

Fastest-Rising Names on Nameberry

Boy Names That Can Start with a C or a K

Cool Boy Names

Names With Lots of Spellings

Dog Names

Badass Boy Names

Cool Dog Names

Hunting Dog Names

Saint Names For Boys 

Confirmation Names for Boys (with Meanings and Definitions)

Boy Names Like Carter

Irish Boy Names (with Meanings)

Badass Boy Dog Names

Saint Names

Irish

Nameberry

Future

England

The name Killian is currently ranked #418 in U.S. births. and peaked for boys at #248 in 2017. The name is most popular in Wyoming, Vermont, and Montana. Killian is occasionally used for girls in 2025.

Cillian

Year	US rank	Births	Per million
2014	—	0	0
2015	—	0	0
2016	—	0	0
2017	—	0	0
2018	—	0	0
2019	—	0	0
2020	—	0	0
2021	—	0	0
2022	—	0	0
2023	—	0	0
2024	—	0	0
2025	—	0	0

Killian

About Killian

Popularity & trends

Similar names

Killian in pop culture

Killian in blog posts

Killian on more lists

Advanced Search

Save Killian