How do you say their names are in French?

There are a few ways to say "their names are" in French, depending on the context:

Formal:

* Ils s'appellent... (literally "They call themselves...") This is the most common and versatile way to say it.

* Leurs noms sont... (literally "Their names are...") This is more formal and less commonly used.

Informal:

* C'est... et... (literally "It's... and...") This is used when you are already talking about the people, so you don't need to repeat "their names are."

* Ils s'appellent... et... (literally "They are called... and...") This is a slightly more formal version of the previous option.

Examples:

* Ils s'appellent Jean et Marie. (Their names are Jean and Marie.)

* Leurs noms sont Pierre et Sophie. (Their names are Pierre and Sophie.)

* C'est Paul et Julie. (It's Paul and Julie.)

* Ils s'appellent Paul et Julie. (They are called Paul and Julie.)

The best choice depends on the specific situation and the level of formality you want to use.