Wikipedia Germany has an article under the name of “Carl Benz”. They write that he was christianized with the name Karl, but later preferred to write himself “Carl”. He published several manuscripts under that name. read more
The German Orthographic Reform of 1901 generally replaced use of the French spelling, Carl, with the former German spelling convention, Karl, and DaimlerChrysler has adopted the use of the birth name spelling, using Karl Benz. read more