The only name I can think of that fits is Rinsuke (林助), but it doesn't have anything to do with water. Although I suppose it does sound a bit like the English word 'rinse'.
◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄◄
http://www.behindthename.com/pnl/65849