An Interesting Etymology: Yenta

From dictionary.com, from American Heritage Dictionary

yen·ta
n. Slang

A person, especially a woman, who is meddlesome or gossipy.

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[Yiddish yente, back-formation from the woman's name Yente, alteration of Yentl, from Old Italian Gentile, from gentile, amiable, highborn, from Latin gentlis, of the same clan. See gentle.]

Update: One interesting thing I was going to comment on - many of the steps in this etymology are interesting, but the last step, the back formation, is particularly so. The L ending of Yentl was part of the word, coming from Old Italian gentile. However, it was interpreted as the diminutive, a suffix indicating familiarity. Thus, e.g. Yossele. Thus, they took away this pseudo-diminutive to generate Yente -- thus, this is a back formation.