Three name people

Tiffani Amber Thiessen (Saved by the Bell, among other shows and films)

Melissa Joan Hart (Sabrina the Teenage Witch)

And the kids from the Home Improvement sitcom:

Zachery Ty Bryan
Jonathan Taylor Thomas
Taran Noah Smith

Gabriel Garcia Marquez (His full name was Gabriel José de la Concordia García Márquez)

Billie Jean King
Sean William Scott (actor)
Millie Bobby Brown
Bobbi Kristina Brown (daughter of Whitney Huston and Bobby Brown, became a reality star and singer)
Evan Rachel Wood
Phillip Seymour Hoffman
Jennifer Love Hewitt
Jamie Lee Curtis (I’m surprised I’m the first in with this one)
Tommy Lee Jones
Melissa Joan Hart
Catherine Zeta Jones
Orson Scott Card
There are loads and loads of them, really.

Technically, you weren’t. There’s a couple others you added that you weren’t the first. No problem, though.

Her name is hyphenated, though.

Jesus H. Christ

Cowboy Bill Watts

When Bill was prez, Hillary made it known she wished to be called Hillary Rodham Clinton, as a tribute to her mother.

At that time, I decided to become a three-namer, too.

Background. At my mother’s decision, my sister and I were not given middle names. I was “VO,” and my sister was “CO.” My mother explained to both of us that when we married someday, our maiden name would become our middle name. Cool. I enjoyed signing my married name with a middle initial!

When Ms Hillary Rodham Clinton made her declaration, I decided I would do that, too.

My daddy’s particular branch of the O-name has died out. None of the sons had sons. So, I would carry the name as a three-name person. I sign everything with my three names, and all legal documents show the three names. Mr VOW and I gave The Son the O-name as his middle name. And when The Son married and produced COTU#3, he also has the O-name as his middle name.

So, I’m not famous enough to make your list, but I’m a three-namer.

BTW, my sister is a three-namer, too!
~VOW

Bzzzzt. See #4.

Harry S Truman

(The ‘S’ is his middle name, IMHO)

Oh my freakin’ god. ~VOW, my mother did the same thing. No middle names for us girls.
I swear we are cosmically linked.
‘Star sisters’

Michael Martin Murphey

One of these things is not like the other…

Stevie Ray …
David Hyde …
Anna Nicole …

Peter Francis Geraci is a Chicago bankruptcy attorney that advertizes on local media…a lot.

Mary Elizabeth Ellis
Mary Elizabeth Mastrantonio
Mary Elizabeth McGlynn
Mary Elizabeth Winstead

J isn’t even his real middle initial. His middle name is Andrew.

Hans Christian Andersen
William Tecumseh Sherman
Albert Sidney Johnson
Nathan Bedford Forrest
John Bell Hood

Nitpicking, but Poe’s middle name was Allan not Allen. Poe was very insistent on this during his lifetime and got annoyed at publishers who misspelled it. It was the name of his foster father, John Allan, who raised him after he was orphaned at the age of two.

So? Perhaps the OP intended to include nicknames (which would broaden the field considerably).

George Armstrong Custer
Henry Morton Stanley

Beck
Da
Wrek.

(:))

Billy Bob Thornton
David Lee Roth (was that mentioned?)
Charles Nelson Reilly
Robert Louis Stevenson