姓氏的用英语怎么表达？

“姓氏”用英语表达为last name/family name。例如：The tramp has forgotten his last name(流浪汉已经忘记了自己的姓氏)。

surname
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姓氏的用英语是
family name

如
His full name is Jim.Allan.Green，Green is his family name.

姓氏

用英语，可以说是

family name

就是家族的名字。