COSMO KRAMER: On the TV show, Seinfeld, Kramer lived across the hall from Jerry in Apartment 5B. The high-strung, eccentric character is known for his hairdo, vintage clothes, entering a room by sliding into it, and his outlandish schemes. But, did you know Kramer is actually a real, living/breathing human being? In real-life, Kramer’s first name is Kenny – and not Cosmo. He was a struggling comedian who, at one time, lived across the from Seinfeld co-creator, Larry David.