Old Irish cáel

← Proto-Celtic *koilos (inherited)

← Welsh cul (cognate)

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

← Cornish - (cognate)

← Latvian kails (cognate)

→ Cebuano Kyle (derived)

→ Welsh cul (cognate)

→ Irish caol (inherited)

→ Scottish Gaelic caol (inherited)

→ Manx collane (mention)

→ Manx keyl (inherited)

→ Cornish cul (cognate)

→ Old Irish cáelán (suffix)