“Jimmy Fallon” is a proper noun referring to the American comedian and late-night host. It comprises a first name, Jimmy, commonly pronounced as /ˈdʒɪmi/ in typical American usage, and a surname Fallon, pronounced as /ˈfɔːlən/ with a later stress on the first syllable. The full name is usually pronounced with clear enunciation of both given name and surname, forming a familiar, informal address in media contexts.
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