I think his name is actually Isaac Hempstead Wright, with no hyphen.  That's the way it's written out on the show, as you can see here in several places, such as 0:31.  TheUnknown285 (talk) 01:31, August 9, 2013 (UTC)

I'm confused...IMDB gives it without a hyphen, while Wikipedia does use a hyphen.--The Dragon Demands (talk) 01:40, August 9, 2013 (UTC)
Yeah, I've seen it both ways.  Like I said, the opening credits don't use the hyphen.  However, the official GoT page by HBO does use the hyphen.  For what it's worth, he lists his name on his Twitter as "Isaac.H.Wright," making it seem like Wright, and not Hempstead-Wright is his last name.  I sent him a Tweet asking him which it is.  We'll see if he answers.  TheUnknown285 (talk) 01:52, August 9, 2013 (UTC)
He says in an interview that there's no hyphen. TheUnknown285 (talk) 08:59, December 15, 2016 (UTC)

Whoa. Wait, how is it spelled in on-screen episode credits?--The Dragon Demands (talk) 15:26, December 15, 2016 (UTC)
The show credits don't have the hyphen either.  TheUnknown285 (talk) 04:31, December 16, 2016 (UTC)