Meisch's list "Welsh Names" of 20 great name ideas: Neiren - Eilir!

Welsh Names

This list includes both ancient and modern Welsh names. Many Welsh names end with the suffix -wen, which means "white, fair, or blessed," so the meanings of these names include one of these, although in many cases the -wen was added as an elaboration only. 

Neiren

Tesni

TRAHERNE

Gwydion

Lowen

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. 
</br></br>Etymologically, Emyr may be connected to the Arabic word and name, emir, as they have similar sounds and meanings. 

Emyr

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. 

Welsh Names

Neiren

Tesni

TRAHERNE

Gwydion

Lowen

Emyr

Llyr

ARIANRHOD

Aelwen

Braith

Aerona

Aneira

Eilian

Eiriol

Aderyn

Fioled

Gwlithan

Adlais

Awela

Eilir