The jinai-cho was called 'Kosaka', which literally means 'small slope', because it was located on a slope up to the plateau, and later came to be called 'Osaka', meaning 'big slope' (it is said that the name "Osaka" started to be used in 1498).
この寺内町が、台地にそった坂にあることから「小坂」、後に「大坂」と呼ばれるようになった（大坂という地名の出現は1498年とされる）。