Meracydia has both Egyptian and sub-Saharan African themes according to what very little we know of it.
We know there's pyramids and Egyptian things like sphinx and shabti. But there's also West African-themed conjurer staff in the game, Kple Kple, that had Meracydia flavor text in 1.0. Also in 1.0 was a mention of witch doctors being from the continent and trading goods with Limsa Lominsan ships.
Considering the writers bothered to have Emet-Selch mention Meracydia, we'll probably end up going there eventually. Especially since we've already used that speech as a guide for 6.1+. Yoshi-P said that where we do end up going after 6.5 will subvert expectations so who knows though.
I don't recall anything Egyptian about Bozja except that the climate was dry because it was right next to Dalmasca. All the people and place names are Slavic-inspired.