Daimler
Karl Benz As in Mercedes Benz
"internal combustion" means just that. It isn't named after anyone in particular.
Rudolf Diesel
Nikolaus was a German inventor who made the first internal combustion engine.
Rudolf Diesel
17th century: English inventor Sir Samuel Morland used gunpowder to drive water pumps, essentially creating the first rudimentary internal combustion piston engine.
a gasoline engine is an Internal combustion engine
There were multiple German inventors who developed internal combustion engines in the late 19th Century, but the name you may want is Otto Daimler.
Rudolf Diesel
Internal combustion engine.
and internal combustion engine and a gasoline engine are the same thing.