大般涅槃經義記 5.137

5.137

二水名喻，明道體一，隨欲分多，此諸水名當應是其異因別語，亦可梵語之差別耳。

Second, the metaphor of the names of water, clarifying that the essence of the path is one, but is divided into many according to inclinations; these various names for water must be distinct expressions arising from different causes, or perhaps they are just differences in Sanskrit.