Oonagh
Meaninglamb · Irish
Oonagh is a Gaelic girl name meaning “lamb”, with Irish roots. Irish names are loved for their lilting sound and their links to Celtic saints and legends. A meaning like this gives a child something to grow into, and a good story to tell when someone asks about their name. It sounds crisp and confident, it's simple to spell and say, and it pairs well with middle names of almost any length.
Did you know?
- GenerationOonagh peaked in 2017, which makes it a Gen Alpha name. The typical Oonagh you'd meet today is about 8 years old.
- HistoryOonagh first shows up in US birth records in 1997, the first year at least 5 babies got it. It has been in use for 28 years since.
US births per million girls, 1997–2025
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Popularity: U.S. Social Security Administration (babies with 5+ births per year).
About the name Oonagh
Oonagh is a girl name of Gaelic origin meaning “lamb”. Its two syllables give it an easy rhythm, and the consonant at the end gives it a confident finish. It's a fresh, modern name that only arrived in US birth records in recent decades. It's rarely heard today, so it stands out while still being a real, established name.
Origin:Gaelic names
More Gaelic girl names
- Girl name: Nora · honor
- Girl name: Hazel · hazel tree
- Girl name: Isla · from Islay
- Unisex name: Riley · rye clearing
- Girl name: Maeve · she who intoxicates
- Unisex name: Kennedy · helmeted head
- Unisex name: Quinn · descendant of Conn
- Girl name: Alana · possibly little rock
Questions about the name Oonagh
What does the name Oonagh mean?
Oonagh means “lamb” and comes from Irish. Other girl names with a similar meaning include Una (“possibly lamb”).
What is the origin of the name Oonagh?
Oonagh is Gaelic in origin, and its meaning traces back to Irish. Other Gaelic names to consider are Nora (“honor”), Hazel (“hazel tree”), Isla (“from Islay”) and Riley (“rye clearing”).
Is Oonagh a boy or girl name?
Oonagh is a girl name.
How popular is the name Oonagh?
Oonagh is rare: fewer than 5 US girls got it in 2025, and it was last given to 5 or more in 2024. It peaked at #11,615 in 2017, so it's a name with history that few kids share today.
What names are similar to Oonagh?
If you like Oonagh, you might also like Una.
What should I know before naming my baby Oonagh?
Oonagh is a Gaelic girl name meaning “lamb”, with Irish roots. Irish names are loved for their lilting sound and their links to Celtic saints and legends. A meaning like this gives a child something to grow into, and a good story to tell when someone asks about their name. It sounds crisp and confident, it's simple to spell and say, and it pairs well with middle names of almost any length. Say it out loud with your last name and any middle names you're considering, and check the initials it makes.