Lenny's last name is Leonard.
The name Lenny is typically short for Leonard.
Lenny
Lenny Leonard
Leonard Freeman went by Lenny.
Leonard Kirtman goes by Lenny.
Leonard.
Lenny Stogel's birth name is Leonard Stogel.
Lenny Adelson's birth name is Leonard Adelson.
Lenny Lies's birth name is Leonard A. Lies.
Lennie Moore's birth name is Leonard Albert Moore.
Lenny Mandel's birth name is Leonard Jay Mandel.