If one believes that all humans are descendants of Noah and one lives in a patriarchal tribal society, one needs to come up with a pedigree.
Ashkenaz is most probably a variation/transcryptian of "Scythian", Iranian rider nomads who were said to rule Eastern Europe, especially the northern shore of the Black Sea.
For completeness: The meaning of Ashkenaz in Hebrew changed to "German" in the middle ages (i.e. it moved from East to Central Europe) which explains why descendants of Yiddish speaking Jews are now known as Ashkenazi. i.e. "German Yews".
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery