Is there any way to change the name of your existing google email address?

Does it work somehow;

I have a gmail that is linked to every google account etc.

youtube, twitch, etc

I would like to change them.

Is that possible?

No.

I also got married and therefore my email address with my old name because it is registered everywhere.

Merging or something is not possible and changing would be pointless, then you can just make a new one.

I'm also interested in my twitch, instagram and twitter accounts, which are all linked to the email

As I said, leave it like that or change everything.

It sucks, but we have to go through that now.