в завершение темы.
вот что он ответил на моё пояснение:
The reason for my asking was that Omar(Lobster) is changed
jewish name for Homer plus Khayam(Khayyam) has also jewish
root,which is Hayem, i.e. life. So, it looks like he was
actually jew. Also, considering that Kazan' kaganat(jewish
state) was on Volga river approximately at the same time and
not too far from the "determined" place of his living plus
lies of so-called historians who changed dates, events and
names of whole nations and their rulers, brought me to this
idea. Thank you for book's reference. I will certainly read
it. By the way, I understand russian, so it is enough if you
write in russian with western font. Take care. Richard.