Quote Originally Posted by Karro View Post
The Latin cognate was Terra Mater ("Mother Terra" or "Mother Earth"). In most latin countries, some variant of "terra" is still the name for our world.
Terra actually (the T is important)
well, Terra means Earth, just like in english, and I belive both may have a similar origin: for the 1000 years that composed middle age... actually, for 1300 years if you add to it when the roman empire united the majority of europe under a same standart... the main language were latin (just like it's english now, for the whole world) and therefore, most european nations called our planet Terra, like the romans, but translating it for their own languages. so, basically, if the 14 thrhones have a originated from a same event, probably somewhere in the past your world (or the part of it you are focusing on) shared a common language, which probably had a name for it. you may keep the name of the original language, or translate it for the language of the nation you intend on focusing on...

some tips:
I-take a name it have on our world, and write it backwards, see if it looks like a good start (earth->htrae; Terra->arret...)
II-with time, names tend to change, specialy if knolodge isn't passed down by written means, even more if the name was given in another language (htrae->threa; arret->ahet...)
III-if the name had some obvious meaning (earth for example) it tends to stick to it... even if later on it's discovered not be exatly true
(Earth for a planet which is mostly water, River for a nation that survived a millenia on a oasis-like river along a desert, even though the desert may be small when compared to the whole world)
IV-in a last stance, if the majority of the know world share a same religion that gives a special name to the world, even if that religions fades away with time, the name tends to survive (midgard->middle earth->média terra->mediterrâneo->mediterrain)