Okay the name of yoh's new oversoul is spirit of sword byakkou. I know for a fact that byakko means "white tiger" in japanese. Its one of the four ancestral gods but thats a totally other topic (gotta love wikipedia).
But in chapter 236 its referred to as a swan by yohken and yoh himself, the most notable time being when yoh states that by wielding the futsu no mitama no tsurugi in his left and harusame in his right he's able to use the "swan" to its full power. But its called spirit of sword byakko? Does anybody know the kanji for white swan?