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English definition of “surname”

surname

noun [C]     /ˈsɜː.neɪm/ US  /ˈsɝː-/ (US usually last name, UK also second name)
A2 the name that you share with other members of your family; last name: Her first name is Sarah but I don't know her surname.Names and titles
(Definition of surname noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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