Welsh byr

← Proto-Brythonic *bɨrr (inherited)

← Proto-Celtic *birros (inherited)

← Middle Welsh byrr (inherited)

→ English beret (cognate)

→ Welsh Rhagfyr (affix)

→ Welsh tal (link)

→ Welsh byrred (suffix)

→ Welsh byrraf (suffix)

→ Welsh byrrach (suffix)

→ Welsh byrfodd (affix)

→ Welsh difyr (affix)

→ Welsh byrddydd (compound)