*this is purely headcanon with certain amounts of research backing it up to make a reasonable conclusion*
okay, here's a footnote. I did this purely because I wrote a fic that INVOLVED the seven kingdoms but only as a passing mention and i really didn't feel like calling them "the air kingdom" or whatever. so i pulled up gen. facts abt vat7k and cross referenced. this is the result of this unholy union, i hope you enjoy
In this universe, there are a total of seven kingdoms that are in alliance with each other. Corona, Koto, Neserdnia, Bayangor, Galcrest, Pittsford and Ingvarr. Alone in its Wiki page, these are just simple names, but due to the growing fandom that is 'Varian and the Seven Kingdoms', I figured it would be prudent if I started attaching names to them.
Each kingdom embodies a certain element and a certain stage of Alchemy. All seven kingdoms probably have a distinct history with alchemy, which might be the reason why they also adhere to certain stages of it. The practice and study of alchemy may be dwindling, but the experience of it has not.
But I won't be covering the alchemy aspect of this, I just figured it was a good fact for you to recall. Instead, I looked into the origins of each kingdom's name and decided its specific element according to the facts I found.
Corona is in possession of the Sundrop and their whole motif circles around the sun. The citizens are bright, happy, and cheerful, and have the annual tradition of lighting the night sky using lanterns.
Also, corona can be defined as the gaseous envelope of the sun and other stars, which is probably the reason they're closely associated with the Light element.
Koto is the Japanese word for thing. From the notes about the seven kingdoms, the Fire kingdom also has some Asian type of influence, despite being more Chinese than Japanese. Because of these associations, I've chosen Koto to be the Fire kingdom. And don't forget about the firework traditions, because those are definitely a thing.
Neserdni is a Bulgarian word meaning "not hearty". Bulgaria is a country that has multiple water resources, including being surrounded by water and having various rivers crossing through its land. Thus, Neserdnia is the Water kingdom.
It was actually a little difficult pinning this country down. Bayangor has a word that relates to the Indonesian language, and Indonesia itself is filled with bustling industry. It would have been a perfect fit for the Industry 'element' except: bayang means shadow. I went for that connection instead.
If Bayangor was difficult to pin down, then Galcrest was even harder. For one thing, there was no language that closely matched up with Galcrest during my initial research for it. So I got the closest variation of it, which was Gilcrest. Gilcrest is a town in Colorado with a history that detailed the use of the land's natural raw resources to contribute to its wealth and prosperity. That was the primary reason I pegged it down as the Earth kingdom.
But due to more recent research, I found that galcr meant calories in Welsh and proceeded to figure out which country it came from. Welsh is a minor language from Wales, a country that is known for its mountainous peaks and several hiking trails. It seemed almost appropriate.
Now, Pittsford, I couldn't place. I did the same thing I did for Galcrest and found a town with the same name in New York. Pittsford, New York is a town that is well received by its residents. New York itself is a city with a LOT of industrial settlements, businesses, and other such objects around it. That's why I made it the Industry kingdom.
Ingvarr was refreshingly simple to research. While the word itself does not mean anything, it's Swedish in nature. I looked up Sweden and found that it was very popular due to its wonderful vantage points of the Northern Lights. If you recall, the Air kingdom is known for its astrological/astronomical advancements. I figured the Northern Lights would be a perfect fit for this category.