Meaning of “last name” in the English Dictionary

american-english dictionary

"last name" in British English

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last namenoun [ C ]

uk /ˈlɑːst ˌneɪm/ us /ˈlæst ˌneɪm/ mainly US UK usually surname

A2 your family name, that you use in formal situations or with people you do not know well

(Definition of “last name” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"last name" in American English

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last namenoun [ C ]

us /ˈˈlæst ˈneɪm/

your family name, which in English comes after other names you are given:

His first name is Julio, but I can’t remember his last name.

(Definition of “last name” from the Cambridge Academic Content Dictionary © Cambridge University Press)