Isaka 【イサカ】1 The Japanese surnames etymology dictionary.
Toukyou-to , Shizuoka-ken . Thing . A variant of 石渡 . It is also the original form of Ishiwata. Kanagawa-ken Miura-shi In early voice Town Miyata tells that it changed from Ishitari door name to Ishiwadar family name. Estimated in the Kamakura period. Shizuoka-ken tells that Chiba-ken Asahi-shi Iioka got a character of "Doo" from the Nichiren of the monk of the Kamakura period due to his achievement. 石渡 reference.