Mercy Miriam is a bit much for me. I think
Mitzi would be an adorable nickname - in fact, I adore it. (The only problem is my aunt had a dog named
Mitzi)
Mimi is out of the question, though - that is what the grandkids call my mom. :-D
Mercy and
Judith is lovely.
I was curious about the streotype -
Christian vs. Jewish. I'm glad you see them as quiet and down-home, though.
I really think that
Mitzi (if she was like her mother) and
Mercy would be perfect. Now if
Mercy was like me, though...she'd have the same issues with her names as I did mine.