Izumiotsu City and Izumisano City in Osaka are created against Otsu City in Shiga Prefecture and Sano City in Tochigi Prefecture respectively; One reason is that Izumi Province (Present day Izumi City) is also known as 'Senshu' and another reason is that the pronunciation of Izumi with two Chinese characters and Izumi with just one Chinese character, in which the first character is deleted, is the same; from these reasons Izumi-OtsuCity in Osaka is created against Otsu City in Shiga prefecture by adding one character from the old provincial name and Izumisano City is created against Sano City in Tochigi Prefecture for the same reasons.
和泉国（大阪府和泉）では、和泉国が「泉州」と呼ばれる事や「和」を除いても同音である事から「泉」の一字を冠している（例：滋賀県の大津市に対して泉大津市、栃木県の佐野市に対して泉佐野市）。