Ganryu' (岩流) is also written as '巌流', '岸流', '岸柳' and '岩龍' (pronunciation are the same) and the changing of kanji characters means nothing (kanji characters were often used in the substitute for other kanji characters which had the same pronunciation).
また巌流は岩流の異字表現に過ぎない、史料によっては他に岸流・岸柳・岩龍という呼称がある。