Probably from Proto-Indo-European *lewk- (“white; light; bright”), because of the cat's glowing eyes and ability to see in the dark. Cognates include Ancient Greek λευκός (leukos), Sanskrit रोचते (rocate), Middle Persian 𐭫𐭥𐭰 (rōč, “day”) and Old English noun lēoht (English light).
- (5th BC Attic): IPA: /lýŋkʰs/
- (1st BC Egyptian): IPA: /lýŋkʰs/
- (4th AD Koine): IPA: /lýŋxs/
- (10th AD Byzantine): IPA: /lýŋks/
- (15th AD Constantinopolitan): IPA: /líŋks/