Boy Name · Irish Origin
Oneil
Oneil — a boy name from the Irish tradition — is an uncommon, standout choice. Its meaning, "Descendant of Niall", anchors the name in something deeper than sound alone. If Oneal is on your shortlist, Oneil belongs in the same conversation.
Oneil meaning, origin, and usage
Meaning: Descendant of Niall
Origin: Irish naming roots help connect Oneil to related Irish baby names.
Pronunciation: Baby Name Studio pronounces Oneil as O·N·E·I·L, with 5 letters and a boy usage profile.
Popularity: According to Baby Name Studio's 2026 tracker, Oneil is an uncommon, standout choice in the Rare tier.
Oneil variants, nicknames, middle names, and sibling names
- Variants and spelling ideas: Oneila, Oneile, Oneily, Onei.
- Nicknames: One and O.
- Middle names: Pair Oneil with a middle name that balances its substantial sound; start with the Oneil middle name generator.
- Sibling names: Oneal, Onalee, Onnie, Orvil, Ona — full picks on the sibling names for Oneil guide for a cohesive sibset.
- Similar names: Looking for names that sound like Oneil? Browse our names like Oneil 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 Oneil
What does the name Oneil mean?
Oneil means "Descendant of Niall" and is of Irish origin.
What is the origin of Oneil?
Oneil originates in Irish naming tradition.
How do you pronounce Oneil?
Oneil has 5 letters and is most commonly stressed on the first syllable.
Is Oneil a boy's or girl's name?
Oneil is primarily used as a boy's name in US records.
How popular is Oneil in 2026?
In our 2026 popularity tracker, Oneil sits in the Rare tier — an uncommon, standout choice.
What names are similar to Oneil?
Names that share Oneil's sound and style include Oneal, Onalee, Onnie, Orvil, Ona.
What middle names pair well with Oneil?
Good middle-name fits for Oneil pair an opposite syllable rhythm: if Oneil is short, lean longer (e.g. classical or three-syllable middles); if Oneil is longer, a one-syllable middle keeps the full name from feeling heavy.
What are good sibling names for Oneil?
Sibling names that pair naturally with Oneil share its rhythm without rhyming — Oneal, Onalee, Onnie all sit comfortably alongside it on a shortlist.