Informal: 你叫什么名字？(nǐ jiào shén me míng zi) What are you called?
Informal: 我叫。。。(wǒ jiào…) I’m called…
This is the most common and polite way to ask someone’s family name in Chinese, however, in general it is not customary to simply ask for the family name:
Polite: 你贵姓？(nǐ guì xìng) What is your family name?
