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."
PERSON definition: a human being, whether an adult or child. See examples of person used in a sentence.
In grammar, we use the term first person when referring to 'I' and 'we', second person when referring to 'you', and third person when referring to 'he', 'she', 'it', 'they', and all other noun groups.
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:
The philosophical concept of person arose, taking the word "prosopon" (Ancient Greek: πρόσωπον, romanized: prósōpon) from the Greek theatre. Therefore, the logos (the Ancient Greek: Λóγος, romanized: Lógos / Verbum), which was identified with the Christ, was defined as a "person" of God.
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."
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).
From Middle Welsh person, ultimately from Latin persōna (“mask used by actor; role, part, character”), probably via Middle English persoun and Old French persone (“human being”).