Proto-Celtic *kom-

→ Breton Kemper (mention)

→ Catalan escombrar (prefix)

→ Gaulish con- (inherited)

→ Welsh Cymru (derived)

→ Welsh cof (inherited)

→ Welsh cyfrin (derived)

→ Welsh cyrraedd (derived)

→ Welsh cyfaill (prefix)

→ Welsh cyf- (inherited)

→ German Kummer (prefix)

→ Spanish escombro (prefix)

→ French encombrer (prefix)

→ Irish comh- (inherited)

→ Galician combarro (derived)

→ Dutch kommer (prefix)

→ Old Irish com- (inherited)

→ Old Irish cummae (mention)

→ Old Irish comarbus (derived)

→ Middle Welsh kyf- (inherited)