No, that's just one of those made-up lies people repeat often enough online to become "true" because it's the top search result and because it makes them feel good about continuing to use that term.
> TO LET, Westmoeath Cottage and Garden, situated near to Cook's River, only
three miles from the city. the cottage contains
parlour and drawing room,and four large bed rooms ;
detached kitchen, bakehouse, landry, storeroom,
four stall stable and double coach-house, servants'
rooms neatly fitted up, together with hay-loft and
granary, school house and master's bed-room. A
cottage containing four separate rooms for overseer
and workmen ; two excellent wells of water on the
premises, about six acres of garden neatly laid out
and planted with the best vines and fruit trees,
'This property is fit for a family of the first
respectability.
You couldn't own slaves in London in 1845, and in any case the name derives from the "Master of the household", so if you want to be mad about it, you should call it sexist, not racist. Or you could just be chill, stretch the meaning a bit and say the couple together are the masters of the household.
But, now I'm curious: Where do you draw the line? You don't like git master branches and master bedrooms, but what about other uses?
You can have a master key, master record, master a skill, create a masterwork, be a master to an apprentice, join the toastmasters, be a master of ceremonies at a formal event, you can dress up for comic con as Master Yoda, Master Chief, or Dumbledore (the Headmaster of Hogwarts), you can be a Master Chief in the US Navy, be the dungeon master for a game of D&D, get a Masters' Degree and so on.
Which of these things are in your opinion bad and should be renamed?
This is very much like asking why are you focused on fixing one bug at a time in your software when you can fix every reported bug simultaneously?
I don't know man, maybe it's because fixing this one completely inconsequential bug faces so much backlash for no particular reason other than "change bad"?
And well done with using an example from a book series where the only Asian character is named Cho Chang and where there are elves with long noses in charge of the "central bank". That really works in your favour, you totally owned me [pun intended] with that one!
> A footman in his lordship's service stated he went into his master's bedroom [...]
isn't an example of the phrase "master bedroom".
I am also skeptical of "school house and master's bedroom". The main cottage has "four large bed rooms". Why would the "master bedroom", if it is meant to be read as it is today, be listed after the list of detached outbuildings?
Here it is for example in an Australian newspaper ad from 1844: https://trove.nla.gov.au/newspaper/article/31742822
> TO LET, Westmoeath Cottage and Garden, situated near to Cook's River, only three miles from the city. the cottage contains parlour and drawing room,and four large bed rooms ; detached kitchen, bakehouse, landry, storeroom, four stall stable and double coach-house, servants' rooms neatly fitted up, together with hay-loft and granary, school house and master's bed-room. A cottage containing four separate rooms for overseer and workmen ; two excellent wells of water on the premises, about six acres of garden neatly laid out and planted with the best vines and fruit trees, 'This property is fit for a family of the first respectability.
Or here it is in London-based The Examiner from 1845: https://upload.wikimedia.org/wikipedia/commons/0/08/The_Exam... (page 523, middle row, a couple of lines below the "Police" headline)
I'm sure I could find more examples, but I think two will sufface.