Irony, me seeing this and you having your DW signature, you.
"Doctor Artist" was a name made up as a nickname by my friend/companion. We met at SacAnime Convention, and she saw my art. I was drawing a lot of stuff that day, mainly Doctor Who characters. She ended up complimenting me about them, then questioned my cosplay. You see, I was wearing what today is known as the Doctor Artist outfit, but at the time it was absolutely nothing. I pretty much just threw on a bunch of clothes from my closet that I never wear, anything that reminded me of the Doctor, y'know? After explaining, she pretty much combined my idea with my art, and called me the Doctor's Artist, then lightbulb, she officialized it as Doctor Artist, and I've kept it ever since.
It ended up sticking, made some artwork of the "Doctor Artist" and kept going to Cons as such, and people liked it, so it just stuck as a character and visual persona of my art pieces.