Robert Krantz's birth name is Haralambos Karountzos.
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Robert DiTillio's birth name is Robert DiTillio.
Robert Serwatka's birth name is Robert Allen Serwatka.
Robert Zenk's birth name is Robert John Zenk.
Robert Keeshan's birth name is Robert James Keeshan.
Bobby Rydell's birth name is Ridarelli, Robert.