What is the meaning of Who?

What person or people; which person or people; asks for the identity of someone; used in a direct or indirect question.

Introduces a relative clause having a human antecedent.

  1. With antecedent as subject.

    With antecedent as subject.

    With antecedent as object: whom.

    Whoever, he who, they who.

    Also used with names of collective nouns that are groups of people, especially singularly-named musical groups or sports teams.

    A person under discussion; a question of which person.

    whose

    who (nominative)

    who (nominative)

    whoever, anyone who (usually nominative)

    anyone, someone (nominative)

    Source: wiktionary.org