No, I didn't have to do anything.

I think it depends on how you change names. I used a name change token to change my username, but I kept the same journal. When you do that, everything you've ever posted anywhere changes to the new name, too.

But if you start a whole new journal, then your old stuff will still be under the old name. Still, I would think you could tell the mods and ask them to consider it all one identity. Then you could just put the new contributor tag on all of them once you got it.