The Welsh Alphabet
The Welsh Alphabet is a version of the Latin alphabet traditionally consisting of 28 letters:
a, b, c, ch, d, dd, e, f, ff, g, ng, h, i, l, ll, m, n, o, p, ph, r, rh, s, t, th, u, w, y
The letter "j" is now often included in the alphabet, between "i" and "l", due to its use in several loanwords from English (especially the common surname Jones).
The letters "k", "v", "x" and "z" are used in some technical terms, like kilogram, volt and zero. In all cases, they can be, and often are, replaced by Welsh letters: cilogram, folt and sero.
The website Acen provides a guide on how to pronounce each of the letters.