Here's a breakdown:
Proper names themselves are NOT third person pronouns. Pronouns are words that replace nouns (like "he," "she," "it," "they," "him," "her," "them"). Proper names are the names of specific people, places, or things (like "John," "London," "Earth").
However, proper names can be the subjects of sentences in the third person. This means the sentence is about someone or something that is not the speaker or the person being spoken to.
Example:
* "John" is a proper name.
* "John went to the store." This sentence is in the third person because the subject ("John") is not the speaker or the person being spoken to.
So, while proper names aren't third person pronouns, they can be used in third-person sentences.