The name Mirabelle is a girl's name of French origin meaning "marvelous". Mirabelle and is often added to lists like Girly Girl Baby Names and discussed in our forums with posts like "Quick Question Thread?!".
From the experts:
If you're looking for a fresher belle name than Isabelle, Mirabelle is lovely, and we also like the extra flourish of Mirabella. And if you want a nature tie, Mirabelle is also the name of a delicate French plum.
Steve Martin chose the name for the heroine of his novel Shopgirl--Mirabelle Buttersfield..
Another pretty possibility: Maribel.