The dairi-bina (literally, Imperial Palace's dolls) originally indicated the pair of the Hina-matsuri dolls, the obina and mebina; however, the mistakes of calling the obina 'Odairi-sama' and the mebina 'Ohina-sama' became a common practice due to the lyrics of the children's song 'Ureshii Hinamatsuri' (Happy Hina-matsuri).
本来「内裏雛」とは雛人形の男雛と女雛の一対を指すが、男雛を「お内裏様」、女雛を「お雛様」と呼ぶ誤りは童謡「うれしいひなまつり」の歌詞から一般化している。