Yup, I did. In grammar school. Grabbed a name out of the phone book and started putting it on all my school papers. Drove my teachers totally nuts.
When I grew up I got a job in Hollywood as a photographer. _Everybody_ had their own "artist names", so I made up one too. I never got famous, so it was kind of pointless, and a whole lot of trouble with any kind of official paperwork.
Many years later I became an artist, and actually made a little bit of money. Not much, but enough to make it fun. Then I formally obtained a pseudonym, got it registered and everything.
None of which did me any good emotionally. The name is just ink on official papers. It was a couple good therapist and lots of 12 step meetings that fixed up my messed up ACoA emotions. Now I don't care what name I use. It is _me_ that matters, and I am doing just fine, ty
Mike