Gakutou 【学頭】2 The Japanese surnames etymology dictionary.
① There is a word in a word meaning "corner". Ishikawa-ken Nanao-shi There are Kojatajima in Uchiura- machi's underwear. Hiroshima - ken Kure - shi Toyotomachi Odori tells that he changed his pronunciation from Kato to Kawatari because he is confused with Kato surname of the same place. Estimated in the Tokyo era.