Family name after marriage

I got married with my Japanese wife and she gave up her maiden name and took my name. Now she has my German name in Katakana on her Koseki Tohon. She told me it is not possible to have separate names in Japan but now I read that foreign marriage is a bit special and we can have separate name. I strongly recommended her to keep her maiden name in Japan since it is easier and cause less confusion. And I keep my name and we have some kind of aliases.

We are also expecting a child who will have dual citizenship and I think it is possible that the child will have the Japanese name in Japan and German name on German passport.

Unfortunately I knew about this Information now which is too late. Many recommended me to keep our names…

Changing back to her maiden name is a hassle I think and need to do on family court. Oh dear, so complicated. Has anyone done this before?

I am afraid that our child will face discrimination with a foreign surname, so I wanna keep the Japanese name for her and our child sake.

by Kentucky-Duck