Also spelled Madog, which was the name of an early Welshman, Madog ap Owain Gwynedd, reputed to have been the first European to discover North America in 1155. Maddox, the name of Angelina Jolie and Brad Pitt's oldest child, is a stronger and more familiar choice.

Llyr is a name with a great meaning and a lovely sound, but that sound is going to be next to impossible to get non-Welsh speaking people to pronounce (google the double L sound in Welsh). If you are outside Wales, you may wish to consider the Irish alternative Lir, which has the same meaning and an easier sound.

This rare sixth-century saint's name has a modern, merry feel.

Emyr is a name that is well-known in Wales, but little heard outside of it. There are several well-known Emyrs, from the famed Welsh novelist and poet Emyr Humphries to footballer Emyr Huws.

Aeron was possibly a minor Celtic god of war, and is definitely a river in modern-day Wales.

This name of a legendary Welsh prince could serve as a more original alternative to Adam or Aidan, though it does sound a tad chemical.

A mythological Welsh name with an intriguing sound, Ceridwen appears in several Welsh legends, in which she is an an enchantress and the owner of the cauldron of poetic inspiration. She is also associated with the great bard, Taliesin, with one 16th-century tale recounting that when her servant consumed a potion of wisdom, intended for Ceridwen's son, Ceridwen swallows the servant, who is then reborn through her as the bard.

Very popular in Wales; this could make a nice middle name in honor of a Grandpa Glenn.

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.

Rarely heard outside of Wales, Arianwen combines the pretty Welsh element gwen with the silvery arian, giving it a metallic and shining meaning. The name is sometimes listed as one of the daughters of the legendary fifth-century king and saint, Brychan Brycheiniog.

Tegwen is a Welsh name that balances between clunky and mystical, sweet and tough. Created back in the 19th century by blending the element teg "beautiful, pretty", with the element wen "fair, white, blessed", it may appeal to those who enjoy Teagan, Gwen, Gwendolyn, and Tesni.

Tolkien may have been inspired by this unisex name of a Celtic goddess of war. Welsh poet Dylan Thomas named his daughter the variation Aeronwy. With goddess names so hot for baby girls, this ethereal choice is one to consider.

Eigra is a name with a great mythological and literary past - it is the Welsh version of Igraine/Ygraine, who was the mother of King Arthur.

A bit of a tongue-twister.

A sweet Marian name consisting of Mair, the Welsh form of Mary, and gwen, meaning "blessed, white".