In the Witcher game series there are different combat styles – indicated by the strong / fast combat trees, as well as Witcher 1's Wolf, Cat, and Griffin styles. I'm pretty sure the different Witcher schools in the written series imply this as well, although I don't remember the books very well. And, in the games, some of the quests involve unarmed combat, although there is no play style associated with it. However, I don't think there is mention of formal styles or techniques of unarmed combat.
My question is – is there any mention of formal unarmed combat anywhere in the Witcher universe – the show, the books, or the games? The answer does not have to be limited to Witcher schools – non-witcher humans, Elves, Dwarves, etc. are good too.