姓【xìng】

姓 is a verb meaning "to have the surname". The surname follows it directly, with no 是.

• × 我是姓王 → 我姓王

我的姓是王 is grammatical, but it is not how people introduce themselves.

您贵姓

nín您guì xìng贵姓 is the polite way to ask, literally "your honourable surname". The answer drops 贵, because 贵 is a courtesy aimed at the other person, and it often adds the full name with jiào叫.

• × 我贵姓林 → 我姓林

姓 or 叫

姓 takes only the surname. 叫 takes the full name or the given name.

• × 我姓林小雨 → 我叫林小雨

Usage notes

These go beyond 姓 as a verb.

Surname first

A Chinese name puts the family name in front: Wáng Míng王明 is Mr Wang, not Mr Ming. Titles follow the surname in the same way.

姓 as a noun

姓 is also the noun "surname".