Why is Queen Elizabeth II named Regina?

To be slightly more exact both are Latin titles Regina applying to women and Rex applying to men. The meaning is more exactly translated "reigning Monarch" having been crowned as the constitutional Monarch and holder of all the powers that go with the position. read more

"Regina" is the Latin word for "Queen," the feminine equivalent of "Rex." English monarchs since at least William the Conqueror have signed themselves with the word "Rex" or "Regina," or just the initial R., after their own names. read more

There is no Queen Elizabeth II of Britain. If you want to be pedantic, you need to get these things right. The current monarch is Queen Elizabeth II of the United Kingdom of Great Britain and Northern Ireland. She is also Queen of several other territories, where she is also styled Elizabeth II. Elizabeth I was, of course, Queen of England. read more