Yazgur is quite a unique family name. I have never met anyone with the same surname, aside from my family of course. When I say my family, I meant my brother, father, mother and me.
Here's a message hoping that someone who'll respond might know more about the family name. Any clues to any websites that may help in research will be appreciated. I will also gladly translate any documents from Russian to English (if it will help the research for the family name).