Rube Demarest's birth name is Demarest, Rubin.
William Demarest's birth name is Carl William Demarest.
Jim Demarest's birth name is James Hugh Demarest-Smith.
Rube Demarest was born on October 26, 1886, in Michigan, USA.
Rube Demarest died on September 20, 1962, in Hollywood, California, USA of cerebral hemorrhage.
Cynthia Rube's birth name is Cynthia Lauren Rube.
Rube Dalroy's birth name is Harry Delroy.
Rube Foster's birth name is George Foster.
Rube Bloom's birth name is Reuben Bloom.
Rube Oldring's birth name is Reuben Henry Oldring.
Rube Walker's birth name is Albert Bluford Walker.
Rube Marquard's birth name is Richard William Marquard.
The Demarest family came from France in the late 1600's and the name has become quite widespread. I can say definitely that there is no close family relationship between the late William Demarest and Robb Demarest.