8 standout rare Irish boy names
These names show how much variety exists beyond Liam and other globally familiar Irish choices.
Cian
A compact Irish name with deep historical use and a clean sound that is easier than many people expect from the spelling.
2025 U.S.: 148 births · #1,310Peak: 2007 · 181 births
Cormac
A sturdy traditional Irish name borne by historic kings and literary figures, still uncommon in current U.S. use.
2025 U.S.: 150 births · #1,298Peak: 2014 · 196 births
Oisin
A major name from Irish legend, usually written Oisín in Irish, with a pronunciation that should be learned rather than guessed from English.
2025 U.S.: 22 births · #4,660Peak: 2020 · 31 births
Lorcan
A traditional Irish name with a strong, compact rhythm and only a small number of current U.S. births.
2025 U.S.: 9 births · #8,656Peak: 2018 · 17 births
Tadhg
A deeply established Irish name whose spelling can surprise English speakers, making reliable pronunciation guidance especially useful.
2025 U.S.: 30 births · #3,742Peak: 2023 · 46 births
Fintan
An old Irish name associated with early saints and legend, easy to read once introduced and very uncommon in U.S. data.
2025 U.S.: 12 births · #6,925Peak: 2010 · 27 births
Lochlann
An Irish name with historical Scandinavian associations, longer than Lochlan and far less common in the current U.S. file.
2025 U.S.: 35 births · #3,355Peak: 2019 · 40 births
Finnian
An Anglicized form connected with Irish saintly tradition, familiar in shape but still well outside the U.S. Top 1,000.
2025 U.S.: 119 births · #1,487Peak: 2016 · 187 births
Names to explore
Irish names that travel easily
Established choices that are uncommon in the U.S. but relatively easy to carry into everyday use.
Cian
A compact Irish name with a clean, modern sound despite its long history.
2025 U.S.: 148 births · #1,310Peak: 2007 · 181 births
Cormac
A sturdy Irish name with a crisp ending and a long history in Irish tradition.
2025 U.S.: 150 births · #1,298Peak: 2014 · 196 births
Eamon
An Irish form with an easy rhythm and a softer sound than many current boys’ names.
2025 U.S.: 102 births · #1,646Peak: 2016 · 182 births
Fintan
An old Irish name with a bright, concise sound and very low current U.S. use.
2025 U.S.: 12 births · #6,925Peak: 2010 · 27 births
Lorcan
A traditional Irish choice with a strong sound and only a small published U.S. count.
2025 U.S.: 9 births · #8,656Peak: 2018 · 17 births
Niall
A classic Irish name that is recognizable without being common in the United States.
2025 U.S.: 96 births · #1,706Peak: 2024 · 110 births
Finnian
Finnian recorded 119 U.S. births in 2025 at #1,487, keeping this exact spelling well beyond the most-used 1,000 boy names.
2025 U.S.: 119 births · #1,487Peak: 2016 · 187 births
Ciaran
An established Irish name whose original spelling remains uncommon in the U.S.
2025 U.S.: 105 births · #1,609Peak: 2025 · 105 births
Seamus
Seamus is a familiar Irish form with a strong heritage connection and modest current U.S. use.
2025 U.S.: 154 births · #1,280Peak: 2008 · 298 births
Traditional spellings and forms
Names that keep a visible connection to Irish-language spelling or long-standing Irish use.
Cillian
An established Irish name that is now more familiar in the U.S. while still sitting well outside the most-used choices.
2025 U.S.: 595 births · #507Peak: 2024 · 668 births
Eoghan
A traditional Irish spelling that feels highly distinctive in U.S. data.
2025 U.S.: 19 births · #5,087Peak: 2015 · 29 births
Oisin
A well-known Irish-language name with a distinctive spelling and low U.S. use.
2025 U.S.: 22 births · #4,660Peak: 2020 · 31 births
Ruairi
An Irish spelling with real heritage appeal and very limited U.S. usage.
2025 U.S.: 17 births · #5,570Peak: 2022 · 21 births
Senan
An Irish saint’s name with a gentle sound and a very small current U.S. count.
2025 U.S.: 12 births · #7,118Peak: 2018 · 12 births
Tadhg
A deeply Irish choice whose spelling and pronunciation are closely tied to the language.
2025 U.S.: 30 births · #3,742Peak: 2023 · 46 births
Tiernan
An Irish surname and given-name tradition with a strong, uncommon sound.
2025 U.S.: 29 births · #3,840Peak: 2007 · 86 births
Odhran
A traditional Irish name that sits close to the SSA publication floor in current U.S. data.
2025 U.S.: 5 births · #13,366Peak: 2022 · 7 births
Lochlann
Lochlann recorded 35 U.S. births in 2025 at #3,355, keeping this exact spelling well beyond the most-used 1,000 boy names.
2025 U.S.: 35 births · #3,355Peak: 2019 · 40 births
Darragh
An Irish name used for boys and sometimes girls, with very low U.S. use in this spelling.
2025 U.S.: 9 births · #8,405Peak: 2021 · 16 births
Deep-cut Irish choices
Very uncommon U.S. options for families who want a stronger heritage signal and are comfortable explaining pronunciation or history.
Conall
An old Irish name with a straightforward sound once you know the pronunciation.
2025 U.S.: 19 births · #5,074Peak: 2016 · 41 births
Malachy
An Irish form with a vintage, literary feel and only a small U.S. count.
2025 U.S.: 9 births · #8,665Peak: 2002 · 35 births
Shay
A short Irish-rooted option that feels accessible while remaining outside the mainstream.
2025 U.S.: 77 births · #1,989Peak: 1991 · 154 births
Mannix
Mannix had just 9 published U.S. births in 2025 at #8,668, placing this exact spelling deep in rare-name territory.
2025 U.S.: 9 births · #8,668Peak: 2010 · 31 births
Donal
SSA published no 2025 count for Donal; this exact spelling had either zero to four U.S. male births nationally.
2025 U.S.: no published countPeak: 1930 · 98 births
Fiachra
Fiachra is part of this curated guide, although the current SSA history file has no separate row for this exact spelling.
2025 U.S.: no published count
Diarmuid
SSA published no 2025 count for Diarmuid; this exact spelling had either zero to four U.S. male births nationally.
2025 U.S.: no published countPeak: 2013 · 6 births
Cathal
SSA published no 2025 count for Cathal; this exact spelling had either zero to four U.S. male births nationally.
2025 U.S.: no published countPeak: 2000 · 10 births
Turlough
Turlough is part of this curated guide, although the current SSA history file has no separate row for this exact spelling.
2025 U.S.: no published count
The data line uses the exact spelling shown. “No published 2025 count” can mean the spelling had zero births or fewer than five, because SSA does not publish counts below five.
Irish spelling is part of the name, not an obstacle
If heritage matters, start with the Irish form you genuinely like instead of automatically choosing an anglicized spelling. Learn the pronunciation first, then decide whether the original form works for your family.
U.S. rarity is not Irish rarity
A name that looks unusual in American data may be traditional or familiar in Ireland. The birth counts here measure only U.S. use of the exact spelling shown.
Pronunciation can vary by dialect and family
Irish orthography follows rules that English speakers may not know, and some names have regional pronunciation differences. A short phonetic hint can help, but native or reliable language sources are better than treating one English approximation as the only correct version.
The most famous Irish names are not rare
Liam is the #1 U.S. boy name for 2025, while names such as Ronan, Kieran and Killian are also widely used. This page keeps the focus on less-used Irish choices rather than labeling every Irish-origin name rare.
Sources for this guide
We use these references for popularity, language, origin or historical context. External sources open in a new tab.
Roscoe's pick
Cormac
Cormac is established, unmistakably Irish and still uncommon enough in current U.S. data to feel distinctive.
More names to explore
Questions parents ask
What are some rare Irish boy names?
Cian, Cormac, Oisin, Lorcan, Tadhg, Fintan, Lochlann and Finnian are established Irish choices that remain uncommon in current U.S. use.
Why are some Irish names hard for English speakers to pronounce?
Irish spelling follows its own sound system. Once those patterns are learned, forms such as Oisin or Tadhg are less mysterious than they first appear.
Are Liam, Ronan and Kieran rare Irish boy names?
Liam is extremely popular in the U.S., and Ronan and Kieran are also much more common than the names featured as rare on this page.
Does this page measure popularity in Ireland?
No. The numerical data is U.S. national data from the Social Security Administration. Irish cultural familiarity can be very different.