It is said that before the Heian period, unrefined sake with moromi (raw unrefined sake) made from rice had been called Dakuro and it changed to present-day Doburoku by regional accents.
平安時代以前から米で作る醪の混じった状態の濁酒のことを濁醪（だくらう）と呼んでいたのが訛って、今日のどぶろくになったと言われる。