Revaliir's common language is Adeluna Trade Language, but each region has their own special culture.
Apoy Island - Filipino/Polynesian
Adeluna – Northern European/Latinised
Mamlak – Swahili and other African languages
Ancense Mountains – Bengali
Egjora – Scandinavian and Germanic
Bohar Plains - Greek
Harena Desert- Middle-Eastern languages
Mo'mey Steppes – Belarusian
Vilmapolan – French and Latinised southern European languages
Highlands - Gaelic
Itjivut – Welsh for the ice elves. Humans: Icelandic
Endapano - Tolkien elvish
Sularia/Arri - Romanian/Turkish, Mash of all cultures in Revaliir as seen fit.
Yovaesh Port - Gaelic
Horae Island - Holly Black Fey, Tolkien Elves, Romanian/Turkish, and various others for each season.
Sihajja - Maltese
Valley of Vada -
Umbral Depths - Dark Elves, Drow fantasy lore (loosely)
Eyota Etu - Native American influences
Iria– Korean
Ataiyo – Japanese
Komiteia – Tolkien Hobbits/Gothic Architecture
Haza Savanna– Mongolian
Karith – Chinese and other SE Asian languages
Koschei – Russian
Baltil - Loosely based on Dwemer(Elder Scrolls)/Chinese Inspired Architecture/Tolkien Dwarf Architecture
Abed – Hindi/Sanskrit/India
Gaharee - Hindi/Sanskrit/India
Jasumin Lake - Thai/Japanese
Feeorin Forest- Slavic influences, Some Celtic Lore, Holly Black/Cassandra Claire Fey Inspired
Kujishoku, The Spirit Realm - Japanese
Railoch - Close ties to Japanese and Korean because of strong ties to both Iria and Ataiyo
Varaz - Hungarian
Zets'Ki Cradle - Georgian, Architecture is more Art Nouveau
Sidhiel - Salvic influences + Tolkien Elves + Elder Scrolls High Elves
Bakulaw - Adelunian Common thanks to Alchemist Camp
Hoja Mesto - Multiple Asian influences
Jayou, The River City - Cambodia
This is more about general culture, ethnicity, and language. Obviously many words will be altered and changed from the original language basis, but the above list works as a rule of thumb.