I found your question very interesting. According to HC Smith's book, there are reasons to wonder if the name is that ancient, per conversations he had with Hebrew scholars. In his book, he suggests that Joachim, the father of Mary (Jesus Christs mother) was the same line that the Y-family comes from. On my website, I have a few pages from his book that you might find interesting. www.geocities.com/rajeang/Genealogy or www.geocities.com/rajeang and click on HCSmith's link/photo.