Yes, milady comes from my lady Comparing the first known usage of lady to its counterpart lord Milady (from my lady) is an english term of address to a noble woman
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It is the female form of milord
And here's some background on milord
If you are wondering why we don't write ladies's, it is because ladies is one of the exceptions, along with girls', parents', players', weeks' and even klingons' it can get a bit niggly with names too Aristophanes' plays, but jesus's miracles and (usually) james. This seems rather a poor act of classification,. Otherwise, as elliot frisch has suggested, lady is the term you want
But in my opinion, if you're talking about clients of yours, be gender neutral Lady can have negative implications in this setting because it is often used in a negative fashion, e.g That lady wouldn't stop talking about. Even when lady macbeth says
And take my milk for gall, that would definitely support the literal humorism theory, but i still don't understand how we get from milk to blood (too much of the blood humor supposedly being the problem).
Where did the saying ladies first originate Did it originally appeared in english countries, or And is this always expressed in a positive/polite tune of meaning The phrase means 'the lady of the house', but in the context of the derivation of the surname tiplady they think 'lady' might imply a man's mistress.
From my research it looks as though lady was originally pejorative It's etymology is mostly hypothesized, but consensus puts emergence of the word circa 1200 The word lady shed its pejorative bonds and reemerged in the mid 1800s to denote a woman of higher social status
