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Kyllian

♂ Boy

Pronounced KIL-ee-ən /ˈkɪl.i.ən/High

Meaning: French-favored spelling of Killian/Cillian, an Irish saint's name debated between cill, 'church', and a root meaning 'strife, battle'Medium

In 30 seconds: The Irish saint's name in French football boots: Kyllian is how France often spells Cillian — debated between 'little church' and 'strife'. Mbappé's first name is its near-twin.

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Origin MediumIrish, French

MeaningFrench-favored spelling of Killian/Cillian, an Irish saint's name debated between cill, 'church', and a root meaning 'strife, battle'

U.S. rank (2025)#4801 ↘ Falling

2025 U.S. births21 boys (0.00% of U.S. boys)

Peak year2023

Total births (all-time)≈ 318

Popularity in the U.S. · SSA data

U.S. births per year (Social Security Administration, 1880–present). Pink marker = peak year.

SSA data updated May 2026. How we source & verify this data.

History & Origin

Kyllian is a continental spelling of Killian (Irish Cillian), whose root is debated: cill, 'church' — fitting its missionary saints — or an older word for 'strife'. France adopted the name enthusiastically, and superstar Kylian Mbappé (one l) sent every spelling soaring through francophone maternity wards.

American use of the y-double-l form is rare, riding both Cillian Murphy's prestige and Mbappé's fame. The name lands soft, saintly, and stadium-tested.

Did you know? St. Kilian, an Irish missionary, became the patron of Würzburg, Germany — where his feast still fills the streets — proof that Irish names traveled long before this French spelling did.

Overall data confidence 75%

Behind the Name — Cillian — etymology, debated

Variations

KillianCillianKylian

Nicknames

KyKill

Famous Bearers

Famous bearers coming soon.

If you like Kyllian…

Killian— the standard anglicized spelling

Cillian— the Irish original Cillian Murphy carries

Kylian— the Mbappé spelling one letter away

Declan— a fellow Irish saint's name gone global

Explore names like Kyllian

By themeirish french saint

By meaningWarrior Blessed / Happy

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Frequently Asked

What does the name Kyllian mean?

Kyllian is a spelling of Killian/Cillian, an Irish saint's name debated between cill, 'church', and a root meaning 'strife'.

How do you pronounce Kyllian?

It's said KIL-ee-ən /ˈkɪl.i.ən/ — three syllables, stress on the first.

Is Kyllian a boy or girl name?

Kyllian is a boy's name.

How popular is Kyllian?

Kyllian is rare in the U.S. and familiar in France.