Likely from Sanskrit चक्षु (cákṣu), from Proto-Indo-Iranian *čákšuš (“eye”), from Proto-Indo-European *kʷékʷḱus. Compare Assamese চকু (soku), Bengali চোখ (cōkh).
ꠌꠃꠈ • (soukó) (objective ꠌꠃꠈ or ꠌꠃꠈꠞꠦ, genitive ꠌꠃꠈꠞ, locative ꠌꠃꠈꠧ or ꠌꠈꠥꠔ, ergative ꠌꠃꠈꠦ)