A name George makes up while he and Jerry are hanging out in the lobby of an office building waiting for a woman Jerry met at a party.
(Episode #2 The Stakeout)
George: We're having lunch with a friend-- he works in the building.
Jerry: What is *his* name?
George: Bert... Har... bin... son. Bert Har-bin-son.
Jerry: Bert Harbinson? It sounds made up.