你的姓氏是什么? 用英语怎么说(或他、她的)

What is your first name ?

What is your name?
你的名字是什么?
What is your family name ?
你姓什么?

What is your name? 你叫什么名字?
What is your family name ? 你姓什么?

What's your name? 询问对方的名字（可能包括姓）
What's your family name? 询问对方的姓

what's your family name?
May I ask/have your family name,please?(更委婉)