Is man a pronoun subject or pronoun object?

The Word 'man' is not a pronoun. The Word 'man' is a noun, a Word for a person.

A pronoun is a Word that takes the place of a noun in a sentence.

The pronouns that takes the place of the noun 'man' are he as a subject and him as an object.

Examples:

The man next door has a garden. Hesometimes gives me fresh vegetables, so I sometimes bake him fresh cookies.