what‘s his last name ; what‘s his family name
他姓氏是什么 His surname is any
他的姓氏是什么 His LastName is what
她从来就不知道他姓什么,只知道他的名字。
She'd never known his surname, only his first name.
《柯林斯英汉双解大词典》
您知道他姓什么吗?
Do you know his family name?
youdao
他姓什么?
What's his other name?
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