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sb's surname
His surname is Wang.
他的姓是王。
姓
先理解核心含义，再看它在真实句子里的用法。
姓
The name that identifies members of a family, as distinct from a given name.
His surname is Wang.
他的姓是王。
一个人名字中通常是遗传的部分,或被视为一个人家庭的标志,可能与家庭其他成员共享,或以某种方式从他们的名字中得出；与该人的名字区分开。
The portion of a person's name that is generally hereditary or treated as an indicator of a person's family, which may be shared with other members of the family, or otherwise derived from their names in some fashion; distinguished from that person's given name(s).
Her surname is Smith.
她的姓是史密斯。
Please write your surname in capital letters.
请用大写字母写你的姓。
Many Chinese surnames are one syllable.
许多中国姓氏是单音节的。
His surname is Wang.
他的姓是王。
In China, people use their surname first.
在中国，人们先使用姓氏。
The surname Smith is very common in the UK.
史密斯姓在英国很常见。
They have the same surname but are not related.
他们有相同的姓氏但并无亲属关系。
Not this
Please write your first name on this line.
Use this
Please write your surname on this line.
错误将“名字”和“姓氏”混淆。英语中“first name”指个人的名字，而“surname”指家族姓氏。
Not this
The surname of me is Wang.
Use this
My surname is Wang.
英语中表示所属关系时，通常使用形容词性物主代词（如my）置于名词前，而不是使用“the ... of”结构，这种结构更常用于无生命事物或正式语境。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
家族姓氏
In many cultures, the family surname is passed down from father to child.
在许多文化中，家族姓氏由父亲传给子女。
常见姓氏
Smith is a very common surname in English-speaking countries.
史密斯在英语国家是一个非常常见的姓氏。
娘家的姓
After marriage, some women choose to keep their maiden surname.
婚后，一些女性选择保留自己的娘家姓氏。
姓氏在前
In Chinese naming order, the surname comes first.
在中文命名顺序中，姓氏在前。
姓氏和名字
Please fill in your surname and given name on the form.
请在表格中填写您的姓氏和名字。
改姓
She decided to change her surname after the divorce.
离婚后她决定改姓。
Use surname naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想'sur'像'sir'，先生的名字就是姓氏。
语域：formal 常见场景：official_documents、personal_information Surname 是正式用语，多用于官方文件、表格或正式介绍中，在日常口语中更常说 family name 或 last name。
surname作为名词，是可数名词，表示姓氏。
Dictionary facts from ECDICT, WIKTIONARY.