I had to take my son to urgent care for an ear infection, and the NP who treated him was named Milady. I'm sure, over time, it would end up feeling like just another name, but I was genuinely thrown by it. It was so awkward. I felt like I should curtsy at the end of the visit as I said "Thank you, Milady."
I trolled the 2011 SSA list for other names that are deferential forms of address or titles, and there were at least 8 of each of these. It's more common for boys than girls. In order from most to least common:
Princess
Queen
Lady
Milady
King
Prince
Major
Duke
Earl
Thane
Sir
Captain
Judge
Laird
General
Boss
Sheikh
Chief
Master
Thoughts on this type of name? Like any? My feelings are mixed. They're so much more loaded than most word names. It's hard for me to imagine looking at a little boy in class (or the grown man who is selling me a car/doing my taxes/in bed with me/whatever) and being forced to call him Master or Boss if I want to use his name. Earl, on the other hand, is so familiar, it barely registers with me, and Queen doesn't feel all wrong, probably because I've accepted the idea of Queenie. I sort of like Thane, but I liked the sound of it long before I knew it was a word.