Oğuzhan is a common masculine Turkish given name.
Therefore "okz" means "clans", "nations", or "arrows" in Proto-Turkic.
In modern Turkish, "-z" is not the plural suffix anymore, having been replaced with "-lar" and "-ler".
Oghuz Turks are the southwestern branch of Turkish clan system.
"Gökoğuz" was a group of Oghuz Turks who migrated to northwest and were the ancestors of the modern Gagauz people.