The noun 'boy' is a common noun, a general word for any young male person.
A proper noun is the name of a specific person, place, or thing. A proper noun for the common noun 'boy' is the name of a specific boy.
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No, the name of a person is a proper noun.
Examples:
The boy was reading a book. ('boy' is a common noun)
Jack was reading a book. ('Jack' is a proper noun)