Why, often in film credits, are the actor’s and character’s name often written as, for example, “Ian McKellen – Gandalf (as Ian McKellen)”, but only for certain cast members?

Question

I’ve seen this a lot on IMDB, and this was just an example using more well-known names. For a direct example, I was looking up the cast for the 1999 film, DragonHeart: A New Beginning, and the lead actor, Chris Masterson, is listed as “Christopher Masterson – Geoff (as Christopher Masterson)”, and another character is ” Vladimir ‘Furdo’ Furdik – Sentry (as Vladimir Furdik)”, but only those 2 actors were listed that way. What does it mean that their character is “as the actor”, but it’s only true for them and not anyone else in the cast?

In: 80

Answer 1

It is almost always due to typographical errors or when the name in the credits is different from their “official name” in SAG or whatever union. Sometimes it is because their name has changed during their career, or sometimes it is because their nickname or better known as name.