I don't know about a "famous bearer", but one of the main characters in Chris Fuhrman's novel The Dangerous Lives of Altar Boys is named Margaret Flynn and she goes by Margie. I think Margie is a much cuter nickname than Maggie.
The Fischer quintuplets are born in Aberdeen, South Dakota, the world's fourth surviving set of quints and the first in the United States. Jimmie, Cathy, Margie, Mary Ann and Maggie join five other siblings and are joined by a single baby sister, Cindy, born September 24, 1964.
This was one of the nicknames friends used for me back in school. In retrospect, it's not a bad nickname, but I hated it at the time. I think Maggie is a slightly prettier nickname. I don't like the idea of either Maggie or Margie used as given names, though, because they are too informal.