What do you use as your personal domain for email?

I'm looking into getting my own domain to use for email for both my partner and I. I was initially considering using both or first initials followed by our last name (example: ajsmith.tld for Ann and John Smith) but then got to thinking about it and realized that might not be best for privacy. It looks great in a professional setting (like job applications, bills, taxes, etc.), though. So I'm unsure. I'm curios what other privacy concerned people are doing. The main goal is to not have to worry about changing account emails when we change email providers.

Edit: thanks everyone! Lots more replies than I expected and lots of good advice. I ended up going with lastname.tld domain and will combine that with aliases for privacy where needed. I might buy a fun domain later as well but for now this works.