Heinrich Koch's birth name is Heinrich Georg Koch.
Eik Koch's birth name is Eik Koch Snchen.
His full name was Heinrich Hermann Robert Koch, in English this would be Henry Herman Robert Koch. So in effect he was using his 2nd middle name as his first. I'd say Hermann Robert since his given name was Heinrich and sir name was Koch. Likely for personal reasons, he chose to use Robert as his fist name. Though Hermann may be acceptable.
Heinrich Koch was born on November 22, 1911, in Bad Godesberg, Bonn, North Rhine-Westphalia, Germany.
Henry Bellamann's birth name is Heinrich Hauer Bellamann.
Fritz Rasp's birth name is Rasp, Fritz Heinrich.
Eik Koch's birth name is Eik Koch Snchen.
Ed Koch's birth name is Koch, Edward Irving.
Garrison Koch's birth name is Garrison Anthony Koch.
Jay Koch's birth name is Julius Koch Jr..
Ralf Koch's birth name is Ralf Karl Koch.
Rod Koch's birth name is Rodney Allen Koch.
Federico Koch's birth name is Federico Ral Koch Valenzuela.
Hawk Koch's birth name is Howard Winchel Koch Jr..
Heinrich Lisson's birth name is Heinrich Nischwitz.
Heinrich Gotho's birth name is Heinrich Gottesmann.
Ilse Koch's birth name is Ilse Khler.
Andre Koch Assis's birth name is Andr Koch Torres Assis.