1 By ilikemints June 12, 2012 2:26 AM It depends I think if you want room for another middle. Maryjoan and possibly Mary-Joan work as a first name, whereas Mary Joan is first-middle said together. I do think it has the potential to be misheard often as Mary Jo, so if that bothers you, I'd rethink it. Other than that, I think it's really cute and I see Minnie (I think this was what you were wanting to use) working well as a nn. The "j" sound also opens up Midge and Madge as feasable nns as well. Of the three, I'm partial to Mary-Joan. I think there's something really charming about the hyphen, and it leaves the option of a "middle" middle name (if that makes sense) open, but isn't necessary.