Boy Name
Ontario
Ontario means “Great lake”. It is used as a boy's name across several naming traditions, 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.
Ontario — a boy name — is an uncommon, standout choice. Its meaning, "Great lake", anchors the name in something deeper than sound alone. If Oneida is on your shortlist, Ontario belongs in the same conversation.
Ontario meaning, origin, and usage
Meaning: Great lake
Origin: Multiple naming traditions are associated with this name.
Pronunciation: Baby Name Studio pronounces Ontario as O·N·T·A·R·I·O, with 7 letters and a boy usage profile.
Popularity: According to Baby Name Studio's 2026 tracker, Ontario is an uncommon, standout choice in the Rare tier.
Ontario variants, nicknames, middle names, and sibling names
- Variants and spelling ideas: Ontarioa, Ontarioe, Ontarioy, Ontari.
- Nicknames: Onta and O.
- Middle names: Pair Ontario with a middle name that balances its substantial sound; start with the Ontario middle name generator.
- Sibling names: Oneida, Ovidio, Octavio, Onesimo, Oneal — full picks on the sibling names for Ontario guide for a cohesive sibset.
- Similar names: Looking for names that sound like Ontario? Browse our names like Ontario 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 Ontario
What does the name Ontario mean?
Ontario means "Great lake". The meaning is recorded in English Wiktionary (CC BY-SA 4.0), and in US records Ontario is used as a boy name.
What is the origin of Ontario?
The exact origin of Ontario is debated, but it has been used across multiple naming traditions.
How do you pronounce Ontario?
Ontario has 7 letters and is most commonly stressed on the first syllable.
Is Ontario a boy's or girl's name?
Ontario is primarily used as a boy's name in US records.
How popular is Ontario in 2026?
In our 2026 popularity tracker, Ontario sits in the Rare tier — an uncommon, standout choice.
What names are similar to Ontario?
Names that share Ontario's sound and style include Oneida, Ovidio, Octavio, Onesimo, Oneal.
What middle names pair well with Ontario?
Good middle-name fits for Ontario pair an opposite syllable rhythm: if Ontario is short, lean longer (e.g. classical or three-syllable middles); if Ontario is longer, a one-syllable middle keeps the full name from feeling heavy.
What are good sibling names for Ontario?
Sibling names that pair naturally with Ontario share its rhythm without rhyming — Oneida, Ovidio, Octavio all sit comfortably alongside it on a shortlist.