i read somewhere, i can't remember where tho. all class names were named in japanese first. and when they were named in english they had to find a word that describes what the japanese word meant. one i remember was gladiator the japanese way of saying it is sword user, which if they put in our english version sword user it would just look silly. so they use the latin word gladiator. so with pugilist you have to remember that word was given in translation and not the word used by the japanese, what you need is a dictionary extract from japanese dictionary for the word they use instead of pugilist,
but after all that i think the elemental magic comes from a monks oneness with the planet