The Dialect that used in Kimi no Nawa(Your name)
As I’m from Takayama-city (Hida Takayama) that is the movie real life location of Kimi no Nawa (Your Name).
In my hometown, we have a dialect that is called “Hida-Ben”, meaning Hida area’s dialect, and yes this Hida-Ben is used in Kimi no Nawa.
Mitsuha and other people in “Itomori town” are speaking Hida-Ben.
*Itomori is not an actual town but most of the atmosphere came from Hida area and around it.