How do you say what is your name in British?

There isn't a specific "British" way to say "what is your name". We use the same phrase as other English speakers:

What is your name?

However, depending on the context and the speaker's personality, they might use slightly different phrasing:

* May I ask your name? (more formal)

* Could you tell me your name? (polite)

* What's your name? (casual)

* Your name is? (short and direct)

It's important to note that these variations are not exclusive to British English and can be used in other English-speaking regions as well.