8 standout rare Welsh girl names
These names combine a clear cultural or linguistic connection with current U.S. rarity.
Aderyn
A modern Welsh name from the Welsh word for bird, with no published 2025 U.S. count.
2025 U.S.: no published countPeak: 2006 · 8 births
Briallen
A Welsh botanical name associated with primrose, vivid and genuinely rare.
2025 U.S.: no published count
Carys
A modern Welsh favorite related to the Welsh word for love, still rare in U.S. births.
2025 U.S.: 32 births · #4,375Peak: 2006 · 196 births
Eira
A Welsh name associated with snow, simple in spelling and still outside the U.S. Top 1,000.
2025 U.S.: 116 births · #1,749Peak: 2025 · 116 births
Olwen
A Welsh legendary name linked to one of the best-known tales in the Mabinogion tradition.
2025 U.S.: no published countPeak: 1917 · 12 births
Rhosyn
A modern Welsh name from the Welsh word for rose, with no published 2025 U.S. count.
2025 U.S.: no published count
Seren
The Welsh word for star has a clean sound and remained far outside the U.S. Top 1,000.
2025 U.S.: 50 births · #3,207Peak: 2016 · 62 births
Rhiannon
A major Welsh legendary name that remained just outside the U.S. Top 1,000 in 2025.
2025 U.S.: 210 births · #1,119Peak: 1999 · 651 births
28 rare names to explore
Welsh nature names
Welsh vocabulary and landscape imagery produce some of the most distinctive names in the group.
Aderyn
A modern Welsh name from the Welsh word for bird, with no published 2025 U.S. count.
2025 U.S.: no published countPeak: 2006 · 8 births
Afon
A modern Welsh word name meaning river, extremely uncommon in U.S. records.
2025 U.S.: no published count
Briallen
A Welsh botanical name associated with primrose, vivid and genuinely rare.
2025 U.S.: no published count
Eira
A Welsh name associated with snow, simple in spelling and still outside the U.S. Top 1,000.
2025 U.S.: 116 births · #1,749Peak: 2025 · 116 births
Eirlys
A Welsh nature name associated with the snowdrop flower and exceptionally rare in the U.S.
2025 U.S.: 5 births · #15,554Peak: 2024 · 8 births
Rhosyn
A modern Welsh name from the Welsh word for rose, with no published 2025 U.S. count.
2025 U.S.: no published count
Seren
The Welsh word for star has a clean sound and remained far outside the U.S. Top 1,000.
2025 U.S.: 50 births · #3,207Peak: 2016 · 62 births
Eleri
An established Welsh name also connected with a Welsh river, but scarcely seen in U.S. national data.
2025 U.S.: no published countPeak: 2008 · 20 births
Ffion
A familiar Welsh choice with a distinctly Welsh spelling and no published 2025 U.S. count.
2025 U.S.: no published countPeak: 2018 · 5 births
Welsh names from legend and tradition
These names connect with Welsh legend, medieval literature or long-established Welsh naming traditions.
Bronwen
A traditional Welsh name with literary and legendary resonance, used only rarely in the U.S.
2025 U.S.: 10 births · #9,569Peak: 1980 · 25 births
Carys
A modern Welsh favorite related to the Welsh word for love, still rare in U.S. births.
2025 U.S.: 32 births · #4,375Peak: 2006 · 196 births
Cerys
A Welsh variant related to Carys, with no published 2025 U.S. count.
2025 U.S.: no published countPeak: 2014 · 22 births
Ceridwen
A name from Welsh legend with a dramatic sound and extremely limited U.S. use.
2025 U.S.: no published countPeak: 2016 · 5 births
Enid
A compact old Welsh and Arthurian literary name that now feels distinctly vintage.
2025 U.S.: 30 births · #4,586Peak: 1920 · 261 births
Gwendolen
An old Welsh form with a flowing sound and only a small number of U.S. births in 2025.
2025 U.S.: 11 births · #9,072Peak: 1971 · 34 births
Olwen
A Welsh legendary name linked to one of the best-known tales in the Mabinogion tradition.
2025 U.S.: no published countPeak: 1917 · 12 births
Rhiannon
A major Welsh legendary name that remained just outside the U.S. Top 1,000 in 2025.
2025 U.S.: 210 births · #1,119Peak: 1999 · 651 births
Blodeuwedd
The flower-created woman of Welsh mythology gives this name one of the strongest stories on the page.
2025 U.S.: no published count
Gwyneth
A familiar-looking Welsh name that remains uncommon in current U.S. use.
2025 U.S.: 114 births · #1,771Peak: 2013 · 288 births
Very uncommon Welsh choices
Several of these had no published 2025 U.S. count, which means either zero to four births or no use under that exact spelling.
Aeronwen
A rare Welsh compound name with the familiar -wen ending and no published 2025 U.S. count.
2025 U.S.: no published count
Aeronwy
A rare Welsh form related to Aeron, almost unseen in U.S. national data.
2025 U.S.: no published count
Anwen
A concise Welsh compound name with only a handful of published U.S. births.
2025 U.S.: 9 births · #10,181Peak: 2004 · 18 births
Lowri
The Welsh form of Laura remains highly unusual in U.S. records.
2025 U.S.: no published count
Mabli
The Welsh form of Mabel has a playful sound and no published 2025 U.S. count.
2025 U.S.: no published count
Blodwen
A traditional Welsh compound name that feels floral and vintage.
2025 U.S.: no published countPeak: 1913 · 8 births
Mair
The Welsh form of Mary is short, traditional and exceptionally uncommon in U.S. data.
2025 U.S.: no published count
Eirwen
A Welsh compound name with a wintry sound and no published 2025 U.S. count.
2025 U.S.: no published count
Arianwen
A rare Welsh compound name with a lyrical, storybook quality.
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.
Rarity check
Welsh names that are not rare in the U.S.
Gwen and Nia both ranked inside the 2025 U.S. Top 1,000, so they are useful style references but not part of the measurable rare list.
Gwen
A distinctive choice worth saying aloud with your surname.
2025 U.S.: 384 births · #725Peak: 1959 · 942 births
Nia
Simple and melodic, with an international feel.
2025 U.S.: 403 births · #702Peak: 2000 · 1,033 births
Origin and pronunciation notes
Names can move between languages, spellings and regions. These notes focus on established associations and common English-language pronunciations, while acknowledging that family and regional usage can differ.
Aderyn
- Origin or association
- Welsh; means “bird”
- Common pronunciation
- AD-er-in
A clear nature word name with almost no measurable current U.S. use.
Briallen
- Origin or association
- Welsh; derived from the word for primrose
- Common pronunciation
- bree-AL-en
A botanical choice that feels distinctly Welsh rather than generically floral.
Carys
- Origin or association
- Welsh; associated with caru, “to love”
- Common pronunciation
- KA-riss
One of the more accessible Welsh spellings for English speakers.
Eira
- Origin or association
- Welsh; associated with “snow”
- Common pronunciation
- AY-ra
Short and visually simple, while still uncommon in U.S. use.
Olwen
- Origin or association
- Welsh legend; a heroine whose story is tied to flowers
- Common pronunciation
- OL-wen
A strong bridge between the Welsh and mythological sections of the site.
Rhosyn
- Origin or association
- Welsh; means “rose”
- Common pronunciation
- HRO-sin
The initial Welsh rh sound may be unfamiliar to English speakers.
Seren
- Origin or association
- Welsh; means “star”
- Common pronunciation
- SEH-ren
Simple meaning, straightforward spelling and real U.S. rarity.
Rhiannon
- Origin or association
- Welsh mythology and medieval Welsh literature
- Common pronunciation
- ree-AN-on
Better known than many names here, but still outside the 2025 U.S. Top 1,000.
Pronunciations can vary by language, region and family. We include origin or meaning details only when the association is well established; see our research standards.
Welsh spelling can carry meaning as well as sound
Names such as Ffion, Rhosyn and Blodeuwedd use letter patterns that are normal in Welsh but less familiar to English readers. That is part of the name, not a flaw to “correct.”
Nature is unusually strong in Welsh naming
Bird, river, snow, primrose, rose and star associations give this page a natural overlap with our nature-name guides without duplicating them.
Rarity here is measured in the United States
A Welsh name can be culturally familiar in Wales while being almost absent from U.S. national records. We use the U.S. data only to describe U.S. rarity.
Posy's pronunciation pick
Seren
The Welsh word for star is simple, bright and still genuinely uncommon in current U.S. use.
More names to explore
Sources for this guide
We use these references for popularity, language, origin or historical context. External sources open in a new tab.
Questions parents ask
What are some rare Welsh girl names?
Aderyn, Briallen, Carys, Eira, Eleri, Ffion, Olwen, Rhosyn and Seren are strong examples with very different sounds and stories.
Are Welsh names hard to pronounce?
Some Welsh spellings use sounds and letter combinations that English speakers may not expect, but many names become straightforward once you hear them.
Is Rhiannon still rare?
It was outside the U.S. Top 1,000 in 2025, although it is much more recognizable than extremely rare names such as Aderyn or Aeronwen.