Quote from Ross in The One with the Birth
Ross: Who the hell is Jordy? Susan: Your son. Ross: I don't have a son named Jordy. We all agreed my son's name is Jamie. Carol: Well, Jamie was the name of Susan's first girlfriend so we went back to Jordy. Ross: Whoa, whoa, whoa. What do you mean, back to Jordy? We never landed on Jordy. We just passed by it during the whole Jesse-Cody-Dillon fiasco.