Endor - in ancient Quenya

Ennor - in Sindarin

??? - in Khuzdûl (I'm an Elf. Why should I know how the Dwarves call it.)

But since the common speech Westron is always directly translated into your language of preference, it is foremost known as - Middle-Earth.

I could go far and wide with descriptions, history and all the things the dearest Professor John Ronald Reuel Tolkien discovered about these lands and the world around, but I advise you to do what he did. Dive into tons of books and discover Arda yourself.
It is not on me to shape your point of view. But I can give you a little nudge.