The P.E.K.K.A is a troop from the mobile game Clash of Clans and its spinoff Clash Royale. Officially, the letters in P.E.K.K.A doesn't actually stand for anything and thus the name doesn't have any meaning. Supercell, the company that developed the Clash games, held a contest on August 22nd, 2012 to see who would be able to come up with the best full-form name for P.E.K.K.A, with the winner being "Perfect Enraged Knight Killer of Assassins." Perhaps not coincidentally,
Pekka is a popular male name in Finland, where Supercell is based, and may have inspired the name for their character.