Oh! I Always Get Those Two Mixed Up!

Isabella Rossellini
Mary Elizabeth Mastrantonio

William Goldman
William Golding
William Gibson
William Gibson

(Oh, I see the first two were already posted. I don't really get the sci-fi writer William Gibson confused with anyone else, but it's confusing that there's a playwright also named William Gibson, along with writers Goldman and Golding.)

The Junior Boys are *NOT* Junior Senior.

Fat City/Stay Hungry

Simon Oakland/Claude Akins

Douglas Brinkley/Alan Brinkley
Jack Williamson/Jack Vance
Nostromo/Norstrilia
Ric Ocasek/Karen O

Joe Higgs/Joe Gibbs

for some reason

actors marshall bell (kuato!)

http://www.filmdope.com/Gallery/ActorsB/1276-20175.gif

and geoffrey lewis (known best maybe for playing the outlaw leader in high plains drifter)

http://www.filmdope.com/Gallery/ActorsL/10294-2541.gif

they're not even really of the same era, i guess they just always showed up in various interesting roles and kinda looked slightly similar.

Laurell K Hamilton/Peter F Hamilton
The Separation/The Alteration

John Wyndham/John Christopher
Triffids/Tripods

Ford Madox Ford/Ford Madox Brown

Richard Karn/Richard Kind

Greg Bear/Gregory Benford

Spike Lee / Spike Jonze (funnily not Spike Jones)

Val Wilmer/Hal Willner/Spike Wilner

Andy Garcia and Mark Strong. Seriously, I thought these two were the same person until very recently.
http://www.bbc.co.uk/pressoffice/images/bank/programmes_tv/drama/300longfirm_strong3.jpg http://www.boston.com/ae/sidekick/blog/Andy_Garcia_XX.gif

Gogol Bordello/Dresden Dolls

Ballad/Silence

Taylor Swift / Hanna Montana

Rikki Fataar/Rikky Rooksby

Americans have heard of Rikky Rooksby?

(I know he's written a couple of books but they're in a pretty over-crowded field and I know the name mostly for him writing for many years for a magazine that was handed out free in music equipment shops across the UK)

(PS seems a good guy and have probably learnt a few things from him, so this is not intended as an insult)
(PPS Kompakt act The Field's real name is Axel Willner, if you want to add anyone else to the confusion whirlpool)

Lightning Bolt
Lightning Seed

for a sec I thought you meant Val Kilmer, so Val Wilmer/Kilmer

Axl Rose
Hulk Hogan

mitchell and webb, mitchell and ness

Cardiacs ≠ Cardigans

Lilith
Judith

Probably not the thread for this, but
the "h" that seems to have gone missing from John Entwistle's name and appeared in Pete Townshend's.

Sean Wilentz (historian)
Sean Wilsey (memoirist, friend of Alex in NYC)

B'nai B'rith / Baha'i

Key Cars
K-Cars

Clan of Xymox
Xmal Deutschland

Roger Williams / Roger Miller

Michael Alig
Michael Azerrad

Wheatus and Weezer. Both were punkish American rock bands that had a novelty hit song in the 90s, never could remember which was which.

Ween and Weezer for me.

Sheila E / Sheena Easton

Lucinda Williams / Victoria Williams

Gil Evans (Miles Davis arranger) vs. Bill Evans (Miles Davis pianist) vs. Bill Evans (Miles Davis saxophonist)

Jeremy Vine and Jeremy Kyle.

Jeremy Vine and Jeremy Kyle.

are brothers, by different father.

Noel Coward / Cole Porter

Boyz 2 Men / They Might Be Giants

I have no explanation for this, but I do mix them up. I'm not sure if I've ever heard either one's music though.

Fiona Apple / Jewel

François Bayle / Frankie Boyle.

Cymande / Mandré / Mandrill

andres malraux, gide and brink

haha jim

Scissor Sisters
Switchblade Symphony