Ancient Greek καί

← Ancient Greek κασίγνητος (mention)

← Hittite (cognate)

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

← Proto-Indo-European *ḱóm (mention)

→ English triskaideka- (mention)

→ English tetrakaideka- (mention)

→ Coptic ⲕⲁⲓ (borrowed)

→ Greek και (inherited)

→ Greek κάτι (mention)

→ Greek καν (mention)

→ Esperanto kaj (borrowed)

→ Ancient Greek τεσσαρεσκαίδεκα (compound)

→ Ancient Greek πεντεκαιδέκατος (affix)

→ Ancient Greek ἑκκαιδέκατος (affix)

→ Ancient Greek πεντεκαιδεκαπλασίων (affix)

→ Ancient Greek ἑβδομηκοντακαιεκατονταπλασίων (affix)

→ Ancient Greek καίτοι (mention)

→ Ancient Greek δυοκαίδεκα (affix)

→ Italiot Greek ce (inherited)

→ Tsakonian τσαι (inherited)