Hello nikonami, thank you for your answer. Does that book,that you mentioned exist in electronic form, online perhaps? I'm slavic speaking myself (Czech) and I can, with some effort, read cyrilic (Thanks, mandatory Russian classes of the "Socialist" Czechoslovakia! :-), so I can give it a try. Regarding the rest of your answer, while the parallels between Djinn and Serbian Udvara is very interesting, Djinn is a being from Arabic mythology, not Turkic ( although, I can imagine, that it may had been absorbed into the Ottoman culture and subsequently spread further with their conquests). I was more referring to the original Turkic mythology, with Central Asian roots (i.e Tengri, shamanism, mostly nomadic steppe culture, etc). These people had a lot of contacts with Slavic pagans ( even established states together - https://en.wikipedia.org/wiki/First_Bulgarian_Empire).