@Mio: Finnish. Hungarian and Estonian are the only Uralic languages that are used as national languages, I think.
When I said they were related to native american languages, I meant more in the sense that they were a series of very loosely-grouped tribal languages. In fact, many of the groups that still speak the less-common uralic languages basically
are native, like the Norwegian Sami, but in northern europe.
Of course, by that logic I supposed I'd have to refer to a lot of African language groups as being 'related', but I just mean similar in that one aspect.
Pony language is a pretty interesting concept, really. If we take the old kingdom as the only pony society, then it's likely all pony languages would likely be a variant of their language. However, given that we've heard 'english' and 'french' (Which I regard as most
Translation Convention for native pony languages) in the show, which are from different linguistic families, this is pretty unlikely.
I like to consider that the old kingdom spread down to a mountain range on the souther edge of the continent, where they ran into a pack of ponies travelling up, and things kinda stopped there. So the 'western' pony languages are largely variants of Old Equestrian, if they bothered to develop into new languages at all(North Passlandic, the language in the north half of the mountin range the language advancement stopped, is basically just Equestrian with an accent. South Passlandic is more akin to Scott's Gaelic), wheras the east continent languages tend to be more varied, due to the continent being divided by several channels and geological features, allowing for more individual language growth. So we have Fancee(French), Furhemian(German/Scandinavian), Zohannonite(Arabic/Persian), Mitaani(Chinese), and roughly a half-dozen variant of the East Islands languages(Japanese meets Filipino meets Hawaiian). And of course old Trottinghamite(Norman) though it's largely evolved into an Equestrian dialect for the sake of a trade relationship.
Languages are fascinating don't even.