Boy Name · Irish Origin
Killian
Killian is a boy's name whose meaning is not firmly attested in the historical record. It is a boy's name of Irish origin, and it is rare in the United States today — outside the SSA top 1,000.
Origin and meaning: English Wiktionary (CC BY-SA 4.0). Popularity: US Social Security Administration.
Killian — a boy name from the Irish tradition — is an uncommon, standout choice. If Keelan is on your shortlist, Killian belongs in the same conversation.
Killian meaning, origin, and usage
Meaning: Killian has a distinctive sound and evolving modern usage.
Origin: Irish naming roots help connect Killian to related Irish baby names.
Pronunciation: Baby Name Studio pronounces Killian as K·I·L·L·I·A·N, with 7 letters and a boy usage profile.
Popularity: According to Baby Name Studio's 2026 tracker, Killian is an uncommon, standout choice in the Rare tier.
Killian variants, nicknames, middle names, and sibling names
- Variants and spelling ideas: Killiana, Killiane, Killiany, Killia.
- Nicknames: Kill and K.
- Middle names: Pair Killian with a middle name that balances its substantial sound; start with the Killian middle name generator.
- Sibling names: Keelan, Kellan, Kylan, Kaylan, Kylian — full picks on the sibling names for Killian guide for a cohesive sibset.
- Similar names: Looking for names that sound like Killian? Browse our names like Killian guide for phonetic-neighbor picks.
- Explore more: use the Baby Name Explorer, name search, AI name generator, and Baby Name Studio homepage.
Frequently asked about Killian
What does the name Killian mean?
Killian has no single meaning that is firmly attested in the historical record. It is used as a boy name in US birth records, and parents usually choose it for its sound rather than a documented meaning.
What is the origin of Killian?
Killian originates in Irish naming tradition.
How do you pronounce Killian?
Killian has 7 letters and is most commonly stressed on the first syllable.
Is Killian a boy's or girl's name?
Killian is primarily used as a boy's name in US records.
How popular is Killian in 2026?
In our 2026 popularity tracker, Killian sits in the Rare tier — an uncommon, standout choice.
What names are similar to Killian?
Names that share Killian's sound and style include Keelan, Kellan, Kylan, Kaylan, Kylian.
What middle names pair well with Killian?
Good middle-name fits for Killian pair an opposite syllable rhythm: if Killian is short, lean longer (e.g. classical or three-syllable middles); if Killian is longer, a one-syllable middle keeps the full name from feeling heavy.
What are good sibling names for Killian?
Sibling names that pair naturally with Killian share its rhythm without rhyming — Keelan, Kellan, Kylan all sit comfortably alongside it on a shortlist.