When you're Ashkenazi Jewish, yDNA tests are often not as useful as they are for Western Europeans--or even Sephardic Jews. yDNA is passed father to son, so it tracks with surnames; therefore a Williams or a McDonald male takes a yDNA test would expect many matches with surnames of Williams or McDonald. But most Ashkenazic Jews haven't had surnames for longer than 200 years (some even less), so generally a yDNA test on an Ashkenazic male yields a match list of multiple completely unrelated surnames.
I've tested males in several of my surname lines, and no one had any matches with their own or similar surnames (other than known relatives). But then a few months back, another Diamond popped up on my father's yDNA kit.
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The first match is Uncle Leibish's grandson (my father's second cousin). The second is this new match |