I love Maren and Marina. Marion and Miriam are lovely, too. And of course, my daughter's name, Maura, is an Irish variant of Mary. I think Mary is really lovely on its own, though. It would be refreshing to meet a young Mary, it's used so seldom these days.
How about putting something in front, like Anne-Marie?
My mom is named Mary so I am always thinking about this...I like the name itself and a few variants but I also think it's sooo sweet as a middle.
Also Mary Elizabeth could be Maisie
Molly and Polly are diminutives of Mary, what do you think of them? My favorite forms of Mary are Mara and Miriam. I second the suggestions of Rosemarie/Rosemary, Amaryllis, and Marigold.
I really love Maris or Marisa and Marissa as a variation of Mary. Although I´m a huge fan of the original Mary, too :)
I know a Mary Claire, but I think just Mary is so dignified and sweet. I would just go with Mary!
Mischa the only surname that would workwould be a shorten version of Ferguson (my last name also ends in son) & thatd be fergie which is a commonly know singer. . All my other family surnames are quite difficult & long aswell. & averelladavina I had no idea that molly out plus would be connected!