Formal:
* On l'appelle... (This is the most common and formal way to say it)
* Il s'appelle... (Used for masculine nouns)
* Elle s'appelle... (Used for feminine nouns)
Informal:
* C'est appelé... (This is a more casual way to say it)
* Ça s'appelle... (This is even more informal, and can be used for both masculine and feminine nouns)
Examples:
* Formal: On l'appelle "La Joconde" (It is called "The Mona Lisa").
* Informal: C'est appelé "Le Louvre" (It is called "The Louvre").
* Formal: Il s'appelle "Pierre" (His name is "Pierre").
* Formal: Elle s'appelle "Marie" (Her name is "Marie").
The best way to choose the right translation depends on the context and the level of formality required.