The Sniffing Accountant - S5-E4
Trivia: The blue jumper in the episode that Jerry wears, and that Kramer also ends up wearing that made people sniff appears in a later Seinfeld episode where George is dating the daughter of a welfare officer. She can be seen wearing it when they are sitting in George's car at one point.
Answer: The name is Delores. He shouts that name at the end of the episode. Then in a later episode, "The Foundation", he runs into her. And he repeatedly calls her Delores.