Most names have some association, when you think about it. Deanna is very tied to Deanna Troi from Star Trek, at least for me. Now, I don't like the Diana Spencer association, either, so I get what you mean, but I have to shout out for Danica McKellar. Yes, she was Winnie on Wonder Years, but she's also a gifted mathematician, has a great "intelligence is awesome" philosophy, and is a vocal advocate for math education, especially for girls. Not a bad person to share a name with.
As for: I'm actually uneasy with Deanna but i don't feel able - safe, really - in confronting my partner about it.
This is a whole other problem. Are you saying you feel physically unsafe discussing names with your partner?