What does 'sic' mean after a name?

Answer 1

It is used to point out a grammatical error, misspelling, misstatement of fact or, the unconventional spelling of a name.

Sic is the Latin word for "thus," or "such." .

(More particularly it should be taken to mean, this is how it's spelled, regardless of how unusual it may seem. In latin sic ("thus") means "as stated". It is usual to appear after a quote that contains the wrong word, poor grammar, an incorrect statement, or, as in this case, after uncommonly spelled names. This ensures a name will not be corrected to its common way of representing it.

For example, Jon Stewart (sic), would guarantee that in some revision it would not become John Stewart.

It could also be used to correct gramatical errors being used in a formal letter, and can be avoided.