Rhowch, cwtch, mwyn have to be Welsh. Classicly Welsh sounding words, and mbrsrtowcs, strxfrm can’t possibly be Welsh. Source: my welsh uncle taught me to pronounce Welsh place names.
Wcstold, wcsoll wmffre could be either but sound really weird as Welsh to me.
I love the Welsh, but holy shit that’s not what those letters are supposed to be for. They and the Irish just made a bunch of shit up when they started to standardize spelling. It makes me understand how Russians feel when Westerners use Cyrillic letters improperly.
Having read your comment I’d like your views on “Wrwgwai” - the South American country of Uruguay.
the letters are “supposed to be” for Latin, a language with only five different vowel sounds.
everyone since has just been making a bunch of shit up.