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Oonagh

Girls' name

Possibly lamb, through Oona

Oonagh has been given to 75 babies in the U.S. since 1997. It was used fewer than 5 times in 2025, so it doesn't appear in the latest year's list — today it's a genuinely uncommon pick. Its peak year was 2016, with 8 recorded.

Babies named Oonagh, 2024

1 in 557,000

Oonagh over time, 1880–2025

Girls
0246818801900192019401960198020002020

Based on births in the U.S. Babies given the name each year. Hover the chart — or focus it and use the arrow keys — for any year. Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Oonagh: meaning, origin, and history

Possibly lamb, through Oona

Irish

What Oonagh means

Oonagh belongs to the name family reached through Oonagh → Oona → Úna. Its meaning is “lamb”.

Dictionary etymologyReferences, data & attribution

Variant spelling of Oona, Una, Anglicized from Irish Úna.

Excerpt from Wiktionary: Oonagh (English) · CC BY-SA 4.0

Wiktionary material is available under CC BY-SA 4.0.

Origin, language, and formation

Oonagh is used in English. Its origins include Irish.

Related names and everyday forms

Related names include Oona and Úna.

American usage and historical context

In the United States, 75 girls were recorded with the name Oonagh between 1997 and 2024. Its highest annual count was 8 in 2016; its best national rank was #12,458 in 2017.

How common is Oonagh?

Oonagh had fewer than 5 recorded uses in 2025, so these figures use 2024, the last year it was published.

Among all babies, 2024
1 in 557,000
6 of 3,342,801 births
Among girls only
1 in 270,000
<0.01% of girls
Rank, 2024
Unranked
Fewer than 5 uses
Coin-flip room size
386,177 kids
Even odds of a second one

Where Oonagh sits on the popularity scale

Rarest published (5 a year)#1 — Olivia (13,544)

Chance at least one other child shares the name

If the other children were drawn at random from the 2024 national name distribution. Real classrooms cluster by region and community, so treat these as a floor, not a ceiling.

Class of 20Under 1%
Class of 30Under 1%
Grade of 100Under 1%
School of 500Under 1%

Put another way: gather 386,177 children born in 2024 and it's an even bet that one of them is another Oonagh. In a class of 30 the chance is Under 1%.

When Oonaghs were born

Half of everyone ever recorded as Oonagh was born before 2017 — so the typical Oonagh is around 8 today.

Median birth year
2017
About 8 years old
Biggest decade
2010s
52.0% of all use
Born in the last 25 years
93.3%
A modern name
Recorded since 1950
75
People you could plausibly meet
Choose a decade

2010s — 52.0% of all recorded uses (39).

Is Oonagh rising or falling?

Rank movement and count movement can disagree — the number of distinct names in use keeps growing, so a name holding a steady count still slides down the list. Both are shown.

Rank vs 1 year ago
—
Not ranked then
Rank vs 5 years ago
New entry
Not ranked then
Rank vs 10 years ago
—
Not ranked then
Births vs 10 years ago
—
Not published both years
Share of its own peak
0%
Peak was 2016 (8)
Years since peak
9
Years
Year-to-year steadiness
Shifting
15.0% average annual change
Best rank ever
#12,458
2017

Spellings of Oonagh

Oonagh is not the most common spelling — Oona is, with 67.2% against Oonagh's 2.8%.

Grouped by closeness of spelling (up to two letter changes), same sex, with a floor on all-time use. It catches Sophia/Sofia and Aiden/Ayden, and misses spellings that sound alike but look different, like Sean and Shawn.

Oonagh around the world

Where Oonagh ranks in official birth records elsewhere in the world. Rankings only — the number of births isn’t comparable between places, so it isn’t shown.

  • England & Wales
    1996–2025
    #2,440
    in 2025
  • Scotland
    1978–2025
    #474
    in 2025
  • Northern Ireland
    1997–2024
    #407
    in 2024
  • Ireland
    1964–2024
    #898
    in 2024
  • France
    1995–1995
    #3,999
    in 1995
  • South Australia
    1969–1969
    #731
    in 1969

Popularity data from Office for National Statistics, National Records of Scotland, Northern Ireland Statistics and Research Agency, Central Statistics Office, Institut national de la statistique et des études économiques and Consumer and Business Services (South Australia). ONS, NRS, NISRA data under Open Government Licence v3.0. CSO, CBS SA data under CC BY 4.0. INSEE data under Licence Ouverte / Etalab 2.0.

Oonagh by the numbers

The raw record for each sex the name is used for.

As a girl's name

Rank in 2025
Unranked
Trend vs 5 yrs ago
—
Best rank ever
#12,458
2017
Peak year
2016
8 that year
First recorded
1997
Last recorded
2024
All-time count
75
Count in 2025
Under 5

Names similar to Oonagh

Matched on shared beginnings and endings, similar length, and comparable popularity.

CaraghClodaghOrlaghDarraghSheilaghOonaShelaghLeaghBronaghSheelagh

Sibling names for Oonagh

Names from the same era and popularity tier — the two things that make a sibling set feel deliberate — skipping lookalike spellings and shared initials.

Explore around Oonagh

Top names of 2016, Oonagh's peak yearThe 2010s in fullOther names that peaked in 2017Girls' names starting with O