Welsh du

← Proto-Brythonic *duβ (inherited)

← Proto-Celtic *dubus (inherited)

← Proto-Indo-European *dʰewbʰ- (root)

← Proto-Indo-European *dʰewbʰ- (derived)

→ English Tondu (mention)

→ Welsh dueg (affix)

→ Welsh penddu (compound)

→ Welsh twyllwr du (mention)

→ Welsh parddu (mention)

→ Welsh düwch (affix)

→ Welsh clymog ddu (compound)

→ Welsh Dulyn (compound)

→ Scottish Gaelic dubh (cognate)