The name Prune is a girl's name of French origin. Prune and is often added to lists like French Baby Girl Names and discussed in our forums with posts like "Names on NB that make you go WOW!".
From the experts:
Prune is a fruit name loved by the French, for whom it's a Plum equivalent. In the U.S., Plum works, but Prune is not a name we'd want to inflict on a child. Prunella is slightly more plausible.