Cadillac rose from the ashes of the ‘Henry Ford Company’. When things fell apart, Ford and a few other key people left to later create the ‘Ford Motor Company’. The remainder of people and manufacturing assets at HFC would become Cadillac.
The name ‘Cadillac’ comes from Antoine Laumet de La Mothe, sieur de Cadillac. He was the one who founded the city of Detroit two hundred years earlier.