The Japanese word 'ryogae' (exchange) came from changing (in Japanese, 'kae' or 'gae') 1 ryo of koban at an exchange house into various other coins, such as hyoryo ginka and the copper coin.
「両替」という言葉は両替商で一両小判を秤量銀貨や銭貨に換（替）えたことに由来する。