Doberman (n) is named after Friedrich Louis Dobermann, a German tax collector who realised he needed some protection from being robbed while doing his collecting. He bred Manchester terriers with Pinschers and Rottwellers with greyhounds, until finally producing the Doberman (the final ‘n’ of his name gradually faded away.
Rottweilers are named after the German town of Rottweil which, during an early Roman occupation of the area, had many villas with red-tiled roofs. Hence the name Rott (signifying red) and weil (roof). The dogs have a long history of herding livestock, pulling carts of butchered meat to market, and guarding the butcher’s takings in leather pouches tied around their neck.