“Hakkapalle” makes no sense. It’s not close to the original name where the inspiration for the class comes from (the Finnish Hakkapeliitta) or the Korean name 하카펠. You even have the name listed as Hackapell next to the Korean name on the Korean website of the game.
And as a Finnish person Hakkapalle sounds ■■■■■■■ stupid compared to either Hakkapeliitta or Hackapell.
Change the name to Hakkapeliitta like some other classes that have their native spelling or Hackapell which I think might be easier to pronounce in English.