Another explanation for its origin is that gold bullion was exchanged for "kochugin" (publicly minted silver coins or chogin) in Ginza (where silver coins were minted, appraised and traded) or that exchanging cupelled and hallmarked silver, i.e., privately minted silver coins, for publicly minted silver coins, was called "nanryogae."
また銀座(歴史)において金地金と公鋳銀（丁銀）を替えること、また灰吹銀および極印銀すなわち市井銀と公鋳銀とを取り替えることを南鐐替（なんりょうがえ）と称したことに由来するとも言われる。