One of the most important thongs I find with Welsh girls names is making sure that they have feminine endings! A lot of the name finder sites have names ending in things like -yn listed as girls names when the ending is very definitely masculine in Welsh- it's your difference between Gwen and Gwyn!
If we have a girl then we're going to call her Tanwen Mari.
Ffion is pretty. I also like Nest/ Nesta. Gwenllian, Lleucu and Llinos are also gorgeous, but there is definitely the pronunciation problem there!
Then you have all the names ending in -wen!
Rhianwen, Arianwen, Maiwen, Aeronwen, Ceinwen, Ceridwen, Branwen, Bronwen, Blodwen, Eilwen, Eirwen, Heulwen, Mairwen, Meinwen, Morwen/ Morwenna, Olwen, Rhonwen, Tegwen!
Tesni is also quite pretty! Then of course you have Sian/ Siana/ Siani. Nerys and Nia are nice too! There's also always the variations on Eleri- Teleri, Meleri, etc! Eluned is quite pretty, but I'd never use it for my child as my ex went out with an Eluned after he split up from me and she was horrible to him! Also, Gwladus, Enerys, Hawis.
There's plenty!

And I'm much better with boys names as a rule!
Beca :wave: