Why yes, I have no reason to believe otherwise. Why do you ask?
While I have heard of a book on the Khazarites I have not yet read it. My primary interest is in the Northern Kingdom and it's progression through name changes to become the Lost Tribes of Israel, then the Celts, etc., and in keeping word usage accurate.
I ask in part because the issue of the Lost Tribes is agendized to the point of absurdity by anti-Semitic purveyors of the lie that the latter-day Jews in Israel (and the Jews scattered throughout the world today) aren't descended from the Jews of the Old Testament.
I invite you to run a search on Arnold Murray of The Shepherd's Chapel in Gravette Arkansas. He believes that the Kenites (decendents of Caan) are actually descended from Satan, whom he believes had sexual intercourse with Eve. From what I can gather, he believes that the modern-day Jews are Kenites...imposters...who steal the name Israelite...no better than common Claim Jumpers, thieves of the good names of others...who attempt to justify their greedy, clutching, grasping actions by subverting the word of God.
I submit that this kind of talk is highly inflammatory and will raise the hackles of observant Jews, evangelical Christians and anyone else concerned about cults, heresy and anti-Semitism.