The title is traditionally used in the Channel Islands, but it’s informal, like the titles of Duke of Lancaster and Lord of Mann. (The Crown possesses the Duchy of Lancaster (the estate of the Duke of Lancaster), but it does so specifically because the duchy defaults to the Crown in the absence of a duke.)
Americans have always been a bit fuzzy on this whole title business anyway.
Well, we did have an Emperor at one point…
Watch out for Her Majesty’s moves: https://me.me/i/she-can-move-in-any-direction-8ffbe3daba8e4415a28643abe00f5a0a
In the historical footnote department on women with masculine titles:
Mary was crowned King of Hungary in 1382.
Jadwiga was crowned King of Poland in 1384.
They were sisters.
(The titles were mostly for coronation and title claim reasons. E.g., Jadwiga got married and her husband gained the title “king”.)