Iarlaith
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Meaning
a spelling of Iarlaithe
How popular is Iarlaith around the world?
Iarlaith does not appear in US Social Security baby-name records, which list only names given to at least five babies in a year. There is no popularity curve to chart: a genuinely rare pick. In Ireland, 68 boys named Iarlaith were born in 2025, the 85th most common name among boys that year.
Iarlaith is on the official records of Ireland.
United States
under 5 a year
Iarlaith does not appear in US Social Security baby-name records, which list only names given to at least five babies in a year. There is no popularity curve to chart: a genuinely rare pick.
Births with a Social Security record. Source: U.S. Social Security Administration
Ireland
1 in 800
In Ireland, 68 boys named Iarlaith were born in 2025, the 85th most common name among boys that year.
share of that year’s name registrations
Exact registered spellings from Irish vital statistics; any name under 3 in a year is withheld at source, and accented spellings (fadas) are recorded reliably only from 2018. This registry counts each spelling separately; the figures above are for the exact spelling Iarlaith, and accented spellings are separate names. Source: Central Statistics Office (Ireland), Irish babies' names
South Australia
last on record 2012
Iarlaith is not on the 2017 record for South Australia, whose registry publishes every name given that year.
The count never rose above 1 in a year, too few to chart.
Births registered in South Australia (not all of Australia) by first name and year of registration, 1944–2017, from the state’s Births, Deaths and Marriages registry, which publishes every name down to a single birth in capitals; a spelling its export repeats inside a year is counted once, and from 2018 only a top 100 is published, so the series ends at 2017. Source: Consumer and Business Services (South Australia), popular baby names
Not on the record in Spain, Mexico City, Argentina, Puerto Rico, England and Wales, Canada, New Zealand, Scotland and Poland: those registries withhold small counts, so rare uses may sit below their floors.
Not on the Chile record: nametree keeps spellings that reached 5 registrations in some year, so rarer uses are not shown. Not on the Montevideo record for 1940 to 2011: that registry withholds nothing, so this spelling was not given there in those years. Not on the France record: nametree keeps spellings that reached 20 births in some year, so rarer uses are not shown. Not on the Austria record for 1984 to 2025: Statistik Austria publishes every first name down to a single birth, so this name was not given there in those years (before 2010 the record covers babies with Austrian citizenship only). Not on Norway’s list: Statistics Norway lists only first names carried by 200 or more living people, so rarer names are not shown.
The Iarlaith deep dive
Whether you’re naming a baby or exploring your own name’s history, this is a personal letter, not a list: where Iarlaith truly comes from, how it traveled, and what a century of records reveals. If you have grown a tree on nametree, it also considers how Iarlaith fits with your family’s names and surname.
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