Welsh cylion

← Breton kelien (cognate)

← Proto-Celtic *kuli (inherited)

← Proto-Indo-European *ḱuH-ló- (inherited)

← Cornish kelyon (cognate)

← Latin culex (cognate)

← Old Irish cuil (cognate)

← Old Armenian սլաք (cognate)

→ Welsh cylionyn (affix)

→ Irish cuil (cognate)

→ Cornish kelyon (cognate)

→ Latin culex (mention)