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?
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The two names which are listed are the one the actor is commonly known as and the other is how the credit in the film is given. The movie may list him with one name, IMDb or other sources May refer to them by another name. This is especially common for actors who have changed their screen names during their career.
Generally these are for actors who have been officially credited under different names.
E.g., Ian McKellen is usually credited as “Ian McKellen” but other times as “Sir Ian McKellen”.
Chris Masterson has been officially credited as “Chris Masterson”, “Christopher Masterson”, and “Christopher Kennedy Masterson” in the past.
Some films use variations on an actors name, and some actors develop a stage name after they first appear in a tracked film (perhaps moving from student films or bit parts into bigger roles). Regardless, the same person can appear in the credits of films with different names.
When IMDB has a record for an actor that has been credited using more than one name, then it makes sure you know which one was used for that particular film).
In your example, “Ian McKellan” has also been credited under the names “**Sir** Ian McKellan”, “**Sir** Ian McKell**e**n”, and “Ian McKelle**r**n”. Same person, different names in the credits.
When actors join SAG-AFTRA, which is the actor’s union, they register a professional name. The professional name must be unique as they cannot perform under the same name as another SAG member. That can be a challenge since there are more than 100,000 members.
For example, the actor Micheal B. Jordan cannot perform under his given name, Micheal Jordan because the athlete (and actor) Micheal Jordan registered the professional name Michael Jordan with SAG first.
Sometimes actors have non-union performances that are credited in IMDB and they later have to select a different professional name when joining SAG. Sometimes actors are better known by a name that they are not allowed to perform with because it is already registered.
What you are seeing is a workaround for the actor to be able to use their common name in credits by listing both their professional and common name.
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