I'm happy to say that Google+ has announced that they will no longer place restrictions on the name you can use. Details on the Google+ Google+ page.
I hope this settles the matter once and for all. I've been on Google+ as Melissa Yeuxdoux for some time, but I've hesitated to link my blog to my Google+ presence (so that, for example, my Google+ feed includes links to blog posts) after reading about some Blogger blogs that went away over "real name" issues. I'm hoping the link will be safe now.