Etymology and distribution of 貞明.

Sadamyou 【貞明】^{レベル3
About 50}  The Japanese surnames etymology dictionary.

Aichi-ken , Hyougo-ken , Nara-ken .

① Shizuoka-ken Omaezaki-shi birth of Shirahua ( Shiloh ). A place name with a record since the Heian period. It was in the Edo period in the same place.

② Shizuoka-ken Hamamatsu-shi Birthplace of Shiraha-cho, Minami-ku. A place name with a record since the Warring States Period. It was in the Sengoku period in the same place.

③ Ibaraki-ken Hitachioota-shi Birthplace of Shirawa Town. A place name with a record since the Edo period. It was in the Azuchi-Momoyama period as a vassal of Mr. Satake based on Ibaraki-ken .