Pokemon What is Johto and Sinnoh?

[ShereRaikou98]

The most obvious bit of Japanese left in the English Pokemon games are of the region names. Kanto's name comes from the real world prefecture of Tokyo and Hoenn is a combination of two Japanese words that mean "abundant relations."
Where in the world do Johto and Sinnoh get there names from? More precisely, where do the "Joto-chiho" and "Shin'o-chiho" names come from?

 

[Staraptor]

I'm not sure if this is accurate, but I remember hearing that Sinnoh's name was based off the word "Snow", because it's cold and stuff. =P

I've no idea about Johto though.

 

[FireMeowth]

Seeing as the Japanese word for snow is... umm... "yuki" (or something like that), I doubt that's the reason it's named so. They usually don't use English words to make Japanese names.