Old Irish cuilenn

← Breton kelenn (cognate)

← Proto-Celtic *kolinnos (inherited)

← Welsh celyn (cognate)

← English holly (cognate)

← Proto-Indo-European *ḱel- (root)

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

← Proto-Indo-European *ḱel- (mention)

→ Breton kelenn (cognate)

→ Welsh celyn (cognate)

→ Irish cuileann (inherited)

→ Scottish Gaelic cuileann (inherited)

→ Manx cullyn (inherited)