The words person and people are not related etymologically. Person comes from Latin persona, meaning "actor's mask; character in a play; person," while people comes from Latin populus, meaning "the people."
A human being is called a person, and while this applies to an actual individual, it also, in grammar, means the type of person — first person being "I/me," second person being "you," and third person being "he/him," "she/her," or "they/them."
A person (pl.: people or persons, depending on context) is a being who has certain capacities or attributes such as reason, morality, consciousness or self-consciousness, and being a part of a culturally established form of social relations such as kinship, ownership of property, or legal responsibility. [1][2][3][4] The defining features of ...
A person is an individual human being. At least one person died and several others were injured. Everyone knows he's the only person who can do the job. My great-grandfather was a person of some importance here. The amount of sleep we need varies from person to person.
The first person ("I" or "we") refers to the person speaking, the second person ("you") refers to the person being spoken to and the third person ("he", "she", "it", or "they") refers to another person or thing being spoken about or described:
Any of three groups of pronoun forms with corresponding verb inflections that distinguish the speaker (first person), the individual addressed (second person), and the individual or thing spoken of (third person).
There are 21 meanings listed in OED's entry for the noun person, one of which is labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.