Ishisada 【石貞】1 The Japanese surnames etymology dictionary.
Yamaguchi-ken Houfu-shi . Yamaguchi-ken Houfu-shi Meiji New surname by monk of Sendoji of Jodo Shin Buddhism in Mita Akimoto Town. In the same temple, from the "50 Tokka" of the warrior who was referred to as Nobuaki Okagawa, Nobuaki Kagawa who had lived after the turbulence of 14 years (the 1st year of Senjin) to 1477 (the 9th year of the civilization), the others are called Kagawa surname I told you. In estimation "meaning" fifty Kagawa "mean. 香川 reference.