Old Irish dub

← Proto-Celtic *dubus (inherited)

← Proto-Indo-European *dʰewbʰ- (root)

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

→ Irish dubh (inherited)

→ Scottish Gaelic dubh (inherited)

→ Ancient Greek τυφλός (cognate)

→ Manx doo (inherited)

→ Hindi डबलिन (derived)

→ Icelandic Dyflinn (derived)

→ Icelandic Dufgus (compound)

→ Old Norse Dufgus (compound)

→ Old Irish dubae (suffix)