χεῖ
χεῖ, the letter khi, χ
Could not find Χείδωρος in Logeion dictionaries.
Χείδωρος Proper-name noun: masculine nominative singular of Χείδωρος
χεῖ, τό, name of the letter χ, IG 2(2).1491.33, Pl. Ti. 36b, Hellad. ap. Phot. Bibl. p.530 B.; later written χῖ, v.l. in Hp. VC 1.