Formal:
* Il s'appelle... (This is the most common and neutral way to say it.)
Informal:
* Il s'appelle... (This is also used informally.)
* C'est... (This is used when you already know the person and are referring to them directly, meaning "It's..." )
Example:
* Il s'appelle Jean. (His name is John.)
* C'est Jean. (It's John.)
You can also use the possessive pronoun "son" (his) before the noun:
* Son nom est Jean. (His name is John.)
Remember that the verb "s'appeler" (to be called) is used for names, while "être" (to be) is used for other descriptions.