Choosing a good pen name that I can later easily say it's me if needed?

Hi all, so I need to choose my author name for independent publishing. I want to be anonymous, but if any issues arise later, I want to be able to say: hey, this is me.

So I was thinking of using a close relative's last name, and maybe my middle name? Is that a good idea? Most people I don't want to find out that it's me don't even know I write, so I should be fine on that front.

So you have any advice/ what do you usually do?

And is it okay to publish under several names (because some people know I wrote a book, but I don't necessarily want them to read the new one lol, I'm such a mess haha)?