The evolution of George's favorite alias "Art Vandelay" is as follows:
George and Jerry try to invent the name of their "friend" whom they are saying that they are meeting. First, George comes up with "Burt Harr...bin...son."
"Burt Harbinson." Jerry says. "Sounds made up."
George moves on to "Art Core."
Jerry: "Art Core?"
Later, when the plan is closer to being put into action, George says that he wants to be Art Vandalay. Jerry reminds him that it is Art Corevelay, but when the name is needed, George uses the last name Vandalay, and the alias is born.