How do you say what is your last name in Chinese?

There are a few ways to say "what is your last name?" in Chinese, depending on the formality and context:

Formal:

* 您贵姓？（Nín guìxìng?） - This is the most polite and formal way to ask. It literally translates to "What is your honored surname?"

* 请问您姓什么？（Qǐngwèn nín xìng shénme?） - This is a slightly less formal but still polite way to ask. It means "May I ask what your last name is?"

Informal:

* 你姓什么？（Nǐ xìng shénme?） - This is a casual and informal way to ask. It means "What is your last name?"

Note:

* In Chinese culture, it's considered impolite to directly ask someone's full name. It's best to ask for their last name first and then their given name if appropriate.

* It's also important to be aware of the tone when asking. A respectful tone is essential when addressing someone's surname.