No, ‘you’ is not a common noun. It is a pronoun.
A common noun refers to a general name for a person, place, thing, or idea, like ‘city’ or ‘car’. In contrast, ‘you’ is used to address someone directly and does not fit into the category of a common noun. Pronouns function differently in sentences and serve to replace nouns to avoid repetition. Thus, while common nouns name general items, pronouns like ‘you’ serve a more specific role in communication.