Who is Blondie and neighbor?

You're likely thinking of the classic 1970s sitcom "Three's Company," starring John Ritter, Joyce DeWitt, and Suzanne Somers.

In the show, there's no character named "Blondie."

However, "The Neighbor" in the show is the character Jack Tripper, played by John Ritter.

The sitcom was about a young man who pretends to be gay to live in a women's apartment. His roommates were Chrissy Snow (Joyce DeWitt) and Janet Wood (Suzanne Somers).

Let me know if you'd like to know more about the show!