Do you really think it's Turkish, Jack? In Polish, the word for "thank you" is "Dziekuje" - which is pronounced almost exactly like "Zhankoye."* I would imagine other Slavic languages have a similar term for "thank you."
So, I figured "Zhankoye" had something to do with giving thanks.

-Joe-

*Well, the Polish is "jen-KOY-uh."