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Baby name

Cillian

Boy

Origin of the name

Cillian is an Irish name; Saint Kilian, an Irish monk, brought Christianity to Franconia in the 7th century.

Rising name

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In 2024, Cillian reached its peak: 668 boys, 1 baby in 5,004. The momentum is recent: births are up 253% over the last five years, compared with the decade before. Its rank in 2025: No. 507. 65% of all babies named Cillian since 1880 were born in the 2020s.
4,084births since 1880
2020sgeneration
No. 463rank at its peak, in 2024

Where babies named Cillian are born

2024

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Tap a state to see its figures.

The darker the blue, the more common Cillian is in the state, compared with its births. White: no births published that year.

Where it is most popular

Compared with the national average, Cillian is most common in Massachusetts (3.8 times) and New York (2), taking into account all births in each state since 1910.

One letter apart

Names from the same era

Krew · Nazir · Tylan · Jesiah · Ocean · Sunny

Born in…

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