Dutch word beulsknecht comes from Dutch knecht, Dutch beul

Detailed word origin of beulsknecht

Dictionary entry	Language	Definition
knecht	Dutch (nld)	(by extension) assistant, -hand, employee. (pejorative) flunky. Servant.
beul	Dutch (nld)	(figuratively) A cruel person, in act or sadistic streak. An executioner, torturer, one who carries out executions and other judicial corporal punishments.
beulsknecht	Dutch (nld)