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English word master bedroom comes from English master
master (English)
Highly skilled.. Main, principal or predominant.. Masterful.. Original. (intransitive) To be a master.. (intransitive, usually with in) To earn a Master's degree.. (transitive) To become the master of; to subject to one's will, control, or authority; to conquer; to overpower; to subdue.. (transitive) To learn to a high degree of proficiency.. (transitive, especially of a musical performance) [...]
master bedroom (English)
A room in a house, in which the head of the household sleeps.