Her first name’s Helen, but I don’t know her surname.
她的名字叫海伦,但我不知道她姓什么。
2.be on first name terms (with somebody)British EnglishBrE, be on a first name basis American EnglishKNOW somebody to know someone well enough to call them by their first name 〔因熟悉某人而〕直呼其名,(与某人)以名相称
first name• Nobodyvotes on a first namebasis.• I was wondering if you know this guy Wilkinson, I forget his first name.• He and Mr. O'Brien were acquainted with one another and on first nameterms.• What's your mom's first name?• Ask to have the name spelled and ask for the first name if it is not mentioned.• Nowadays, everyone seems to call everyone else by their first name, even though they've never met them before.