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Otto Malmberg's birth name is Otto Fredrik Malmberg.
Otto
Otto Jespersen goes by the nickname "Otto" or "Otto Jr." in his comedy sketches and performances.
Otto Modersohn has written:
'Otto Modersohn, Zeichnungen' -- subject(s): Exhibitions
'Otto Modersohn'
'Otto Modersohn 1865-1943'
The Chemistry Nobelist "Otto" is Otto Hahn. German who discovered nuclear fission. The prize was awarded him in 1944.