Why do we use the name John Doe to signify the average schlub down the street? Was there a real John Doe?
And is anyone named John Doe today?(yes, I know there’s a rock star/actor named J.D. but he doesn’t count) If someone real existed, does that mean the Doe family line has run out?
And finally, can you change your name to John (or Jane) Doe?
Since there are lots of “natural” John Doe’s around, I can’t see a judge denying your request. The usual rules are that if you have been using the name for 1 year, and can drag along a witness to prove it, they will approve any name. They suspect names that imply you might be wealthy, like Vanderbilt, but even those are approved if you offer some rationale.