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i'd guess Mare or May. you can use Molly and Polly as well. Mitzi can be used for a pet form of Maria (although i beg you, please don't use it on a human!)
there are lots of variations of Mary (Marie) though you might like to consider:
Mara
Marah
Amara
Maleia
Maliana
Maraea
Maria
Mariah
Marian
Marianne
Mariel
Marielle
Mariella
Marion
Marilyn
Marisol
Merissa
Miriam