Dick Trickle?
Hugh Jackman. The first time I read it, I wondered why Entertainment Weekly was printing a crank call.
Isaac Asimov had to assure many times that his name was indeed Isaac Asimov and that it wasn’t a pseudonym
Can I just say how much I love the idea of a dark elf named Chip? It makes so much sense, too. If you were doing a D&D-as-college parody, the dark elves would totally be the preppy kids.
“Billy West… what a stupid phony made-up name!”
Even worse in that respect: Dick Hyman, who’s a musician, not a porn star.
I had to go look this up to verify: Peter O’Toole.
I have assumed for most of my adult life that that was a pseudonym.
Whoa. I’ll bet it’s been a while since he hasn’t been referred to as his role on Lost instead.
To the OP, baseball players Milton Bradley, and my 12 year-old self just informed me I must include Rusty Kuntz.
Mike Hunt, former Green Bay Packer linebacker.
Whose entrance to a game would invariably prompt me to announce either “He got game” or “He came to play.”
And whose exit one inning later would invariably prompt me to shout lines from “Punch Out” or “Mortal Combat.” 
Dick Van Dyke. If he had a dollar for every possible joke about his name he’d be the richest man in show biz.
I’ve known people named Mike Hunt and Dick Screws over the years. The latter was from a family of lawyers, one of whom was given first billing when he made partner in a firm because no other combo worked (i.e. Screws Jones Smith isn’t perfect but Jones Smith Screws is worse and Jones Screws Smith is worst of all).
I guess I could also mention Gordon Lightfoot.
I had a professor in college who wrote an episode of NYPD blue, so I’ll consider him famous enough for this thread.
His name was Rift Fournier. Awesome.
Two magicians on the recent Penn and Teller show Fool us had the surnames of Young and Strange, and named their act accordingly.
Kirby Puckett
Zoilo Versalles
Southern California weatherman Dallas Raines. I saw an interview with him a few years ago in which he confirmed that, yes, that really is his real name.
Former New York Met Howard Johnson.
Local weatherman Larry Sprinkle.
Local traffic reporter Trip Harder.
I watched the movie Larry Crowne recently and there is an actress named Gugu Mbatha-Raw in it. And I was thinking, “Where the hell did she come up with a name like that?”
Turns out she found it on her birth certificate. Gugulethu Sophia Mbatha-Raw is her real name.