I assumed "Vog" was just a made up name, sharing similarities with the word "God"
But as I was checking wikipedia to see if he was named after some other mythical deity (such as Bahamut or Leviathan etc) I found out that vog is a real thing:
Vog is a form of air pollution that results when sulfur dioxide and other gases and particles emitted by an erupting volcano react with oxygen and moisture in the presence of sunlight. The word is a portmanteau of the words "volcanic" and "smog".
Pretty cool. I don't know how I've never heard of this before. It's like when I found of the "Pahoehoe" enemy from Breath of Fire 4 or the Kamehameha was named after a real thing.
So it seems like (as far as I can tell) the only boss not named after something else is Lord Vanaduke.
Interesting.