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I think it isn't used as much as it might because it has a kind of hillbilly vibe to it. Like the three girls in the old TV show Petticoat Junction: Bobbie Jo, Betty Jo, and Billie Jo. I'm sure they were all given the same middle name, and that particular middle name, to fit the countrified theme of the show.

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I had a science teacher named Jo in the eighth grade. Her name was Joanne but she was usually called Jo. Hateful old woman.