Wikipedia
Gökhan
Gökhan is a Turkish forename meaning "ruler of the sky" related to Tengrism. The stem of the name comes from the "Gök"[ɟøk, goek] and the "(K)Han" [kahn, kan ; Han] words. Gök means sky or heaven in Turkish and Khan is (in the Altaic group of languages) a title held by hereditary rulers or tribal chiefs.
Most likely, the first appearance of the name Gökhan is as one of the six sons of Oghuz Khagan, the legendary ruler of the Oghuz.