Someone called me yildiz ay today what do they mean

 Yıldız means "star" , Ay means = moon

So that would be Star moon. I dont know what that person´s intention by calling you Star moon, but what I know is  "Yıldız" is a female name in turkish. There is no name only " Ay "

If we just say  " Yıldızay  " could be used as surname as one word. So these are the possiblities. There is not a special meaning to call someone "Yıldız ay". 

That person might wanted to give you a turkish name as " Yıldız " , or as surname " Yıldızay"

cheers matey

Could it have anything to do with the crescent moon and star of the Turkish flag?

Ay yildiz (moon and star)

Or maybe like "yildiz eh?" , like ´you´re a star, eh´ (for all your previous translations)

well I thought something like that . it was the bar man in my local he was talking about me to a punter and said jilly yildiz ay( they were talking about my dancing)