Pam Dawber, that's what I picture. Agh, I am becoming irrelevant! [echoes into the past] Zooey Deschanel is sort of like Pam II. Unreal!
But no, Mindy is just a nickname for Melinda so I picture Melindas. Softspoken and wry divorcee, long salt and pepper hair, who dresses really nice for work. And it reminds me of Cindy, which is a little bit aggressive and witty, so a dash of that for calling herself Mindy.
I'm not into it as a first name standing alone. It seems a little too girlish. I would rather be Melinda called Mindy than just Mindy.