As with many aspects of Jewish culture, religion, genetics and heritage, the origins of Jewish last names is ensconced in more myth than fact.
Despite its cultural significance and its “eternal” nature in our imaginations, there was a time in Jewish history where Hebrew simply vanished.
Many Jews living in Israel, North America and Western Europe believe some of their ancestors spent the Middle Ages in Spain — and it’s simply not true
The Khazarian hypothesis is not the only junk science Jewish origin story. A similar myth has been propagated about the Jews who lived in the Maghreb.
Globally speaking, all arguments suggested by proponents of Khazarian theory are either highly speculative or simply wrong.