Aeronwen

This Welsh river name has possibilities as a place name and nature name that is rare and uncommon.

Alwyn

Anwen is one of the simplest and best of the classic Welsh girls' names, more unusual than Bronwen but with the same serene feel. 

Anwen

Rarely heard outside of Wales, Arianwen is one of many pretty wen-ending names prominent in ancient Welsh legend.

Arianwen

Arwen is well known as princess of the Elves in Tolkien's Lord of the Rings. The author took inspiration from Welsh for many of his character names, and indeed Arwen and its masculine counterpart Arwyn do have a modest history of use as legitimate Welsh names, deriving from the -wyn suffix ("fair, blessed") plus an intensifying prefix.

 Trivia tidbit: The International Astronomical Union names all colles (small hills) on Saturn's moon Titan after characters in Tolkien's work; in 2012, they named a hilly area "Arwen Colles" after Arwen.

Arwen

Arianwyn

Berwyn

An unusual floral -wen name which was the name of an 1878 opera by Welsh composer Joseph Parry.

Blodwen

This is an attractive Celtic mythological name, popular in Wales and a cousin of the better known Bronwyn. In Welsh mythology, Branwen was turned into a bird.

Branwen

Bronwen is widespread in Wales, but still rare enough here to sound somewhat international — we think Bronwen is a real winner. (Note: the Bronwyn spelling is an Anglicization, since the -wyn ending is masculine in Welsh).

 Bronwen Morgan is the lovely heroine of the classic novel and movie How Green Was My Valley. In Welsh mythology, Bronwen was the daughter of Llyr, the god of the sea.

 Close cousin Branwen appears in Welsh medieval literature as a tragic figure who was turned into a bird. The ancient Welsh worshipped her as the goddess of the moon and love.

Bronwen

One of the loveliest of the <a href="https://nameberry.com/baby-names/172/welsh-names">Welsh names</a>, striking the perfect balance between being familiar and unusual. In Wales, the female spelling is always Bronwen, but Americans usually see a "y" as adding femininity.

Bronwyn

Celtic goddess of poetry, though less-than-poetic name. 

Ceridwen

Caerwyn

Carwyn

Ceinwen

Cerridwen

Cerridwyn

Cledwyn

Colwyn

Dilwen

Welsh heritage choice that's rare today even in its native land.

Dilwyn

Delwyn

A beautiful modern Cornish nature name that is rapidly picking up steam in the States: even spawning variant spellings like Elowyn and Elowynn. In its native region, it wasn't widely used as a name before the twentieth century, when the Cornish language was revived. A (currently) unique member of the fashionble El- family of names, it has a pleasant, evocative sound.

The traditional Cornish pronunciation is with stress on the middle syllable: eh-LOW-en. But most English speakers seem to pronounce it with first-syllable stress, perhaps on the example of more familiar names like Eleanor and Elodie.

Elowen

A charming Welsh name with a great meaning, borne by E. B. White, author of Charlotte's Web.

Elwyn

A literary name created by J. R. R. Tolkien for a Lord of the Rings noblewoman of Rohan. Properly spelled with an accent over the first E – Éowyn – it would make an interesting choice for literature lovers or fans of names like Elowen and Evelyn.

Eowyn

Eilwen

Eirwen

Eurwen

While Gwen may have originated as a short form of Gwendolen and Gwendolyn, these days it frequently stands on its own. Rocker Gwen Stefani has given it a shot of cool, and parents are choosing it as a standalone more and more often—Gwen hopped back onto the US Top 1000 in 2013 after an absence of over 30 years. Gwen could also be short for Guinevere.

Gwen

A male name in Wales, Gwyn has been mostly feminine in the US thanks to its resemblance to the more familiar Gwen. It derives from the same Celtic root as the popular Finn family of names.

Gwyn

Takes Edwin one step -- make that ten steps -- too far. 

Heddwyn

Heulwen

Islwyn is the name of a mountain in Wales which has a pleasant fluid sound. Islwyn has recently been made more familiar through Runescape.

Islwyn

Lynwen

Mairwen

Maldwyn

Meinwen

Morwen

Nolwen

Olwen is a Welsh favorite, the name of a legendary princess in what is believed to have been the earliest Arthurian romance, and in fact one of the first recorded examples of Welsh prose.
 In this tale, Cuthwch and Olwen, the giant's beautiful and gentle daughter Olwen has the magical power to cause white clovers to spring up wherever she walked--an enchanting image. There's a darker side to the story too, in which Olwen's marriage curses her father to die.
 Olwen is a Bronwen alternative for those with a taste for the more unusual. Those who like Olwen might also want to consider such other Welsh girls' names as Anwen, Rhonwen, and Nolwenn.
 24's Xander Berkely and Sarah Clarke used the Olwyn spelling for their daughter.

Olwen

Olwyn is a popular Welsh name that might be an alternative to the more familiar Bronwen or Rhonwen -- though in Wales the female form is usually spelled -wen and the male one -wyn.

Olwyn

Owen, a resonant Celtic name, has ranked among the Top 100 boys' names in the US for 20 years and is now at its highest point ever.
 
Why do so many parents love Owen? It's a classic with a genuine history, yet it's right in step with the modern trend for two-syllable, n-ending boys' names. Owen-like choices with less tradition behind them include Logan, Bowen, and Rowan.
 Owen is derived from two names—the Welsh Owain and the Celtic Eoghan. Each are connected to Eugene, which ultimately came from the Greek word eugenes, comprised of the elements eu, meaning good, and genes, "born." 
 
Owen became a Welsh patronymic surname during the Renaissance. The legendary St. Owen was a Benedictine monk who was a follower of St. Chad.
 
In Ireland, Owen may be spelled Eoin, as in Irish writer Eoin Colfer, and Eoghan. Other similar names include the Scottish Ewan or Euan and the French Ouen.
 
Owen's popularity now extends beyond English-speaking countries to France, Belgium, and the Netherlands.

Owen

The delicate and haunting Welsh Rhonwen is still a rarity in the U.S., where her English version Rowena is better known, but would be a lovely choice for any parent in search of a name that was both unusual and traditional, classically feminine yet strong.
 Though <a href="https://nameberry.com/baby-names/168/irish-names">Irish names</a> have long been popular in America, <a href="https://nameberry.com/baby-names/172/welsh-names">Welsh names</a> are just beginning to be noticed and we see them as a wave of the future. In medieval Welsh poetry, Rhonwen is called "the Mother of the English Nation," and Rhonwen Baganes was a heroine of Welsh folklore. A soft and gentle name, Rhonwen's meaning -- slender and fair -- evokes the image of a lovely, light-haired girl. Other appealing 'wen' choices include Aelwen, Arianwen, Branwen, Bronwen. Gwendolen, Olwen and Tanwen. Just don't be tempted to change the 'wen' to 'wyn', which would transform it into a male name.

Rhonwen

If you're looking for an unusual alternative to all those Rose names, Rhoswen might be a good choice. This name has the soft sounds we've come to love from the Welsh language but is still not as familiar as Bronwen and Rhiannon.

Rhoswen

Tegwen is nowhere near as pretty as its meaning. Other -wen names -- Anwen, Bronwen, Rhonwen -- have more appeal.

Tegwen

LaurenDH's list "-wen/wyn names" of 45 great name ideas: Aeronwen - Tegwen!