Kleinmann is a common surname:
Dieter Kleinmann (born 1953), German politicianGeorges Kleinmann, a French journalistLarissa Kleinmann (born 1978), German cyclistLouis Théodore Kleinmann (1907 - 1979)Ralf Kleinmann (born 1971, Cologne, Germany), a German-American football playerWilhelm Otto Max Kleinmann (1876 - 1945)Kleinmann's Tortoise (Latin: Testudo kleinmanni, also Egyptian Tortoise, Leith's Tortoise)