Moreover, some argue there is evidence that he was born in the Echigo region, because in some part of his work, the 'i sound' and 'e sound' were mixed, which was distinctive characteristics in the Echigo region dialect.
また、井月の作品の一部に、越後方言に顕著な「イ音」と「エ音」の混同が見られるため、これを越後地方出身の証拠とする論もある。