His name seems to be derived from "car accident". In the first Post-Game DLC scenario the game even outright references this. As he is revealed to have gotten into a second car accident sometime after the events of the game, in which Maya says that "he should change his name because it's jinxed"
His last name "Accidenti" is actually Italian for "damn", which may explain why his name is completely different in the Italian localization of the game.
He bears a striking resemblance to the young Leon Bronev