It is said that the neighbors found the simmered Japanese radish delicious and the simmered Japanese radish was named as 'Furofuki daikon' after its associated process in which the water vapor of the boiling water used to simmer Japanese radish was blown into the Furo.
すると、これがおいしいと評判になり、風呂にゆで汁を吹き込んだ残りの大根であることから、「風呂吹き大根」の名前が生まれた、というもの。