If anything, the Gryphons themselves strike me more as referencing Turkey.
I remember hearing about Zecora being a reference to Obeah witchcraft -- something you'll find in the Caribbean among (West) African descendants.
Ponies seem to be a mixed bag of different European cultures. You'll find a bit of Ancient Greek, Roman and Nordic mythological references. As far as architecture goes, it's very much Western Europe.
Changelings... I'm drawing a blank there.
Yaks are pretty obviously a reference to Central Asian peoples. It's this area of the Asian continent where you get different territories (whether countries or regions) with names that end in -stan. I also get Mongolia vibes from the Yaks.
As far as I know, Hippogriffs are a purely a thing from Ancient Greek mythology.
As for dragons, they're the Western type of dragons that are mean in contrast to Eastern dragons who tend to be gentle and wise. "Western" here could include references from Slavic, Germanic, Greek and Roman mythologies.