Etymology and distribution of 貞井.

Sadai 【貞井】^{レベル2
About 40}  The Japanese surnames etymology dictionary.

Oosaka-fu , Ishikawa-ken .

① Oosaka-fu Fujiidera-shi Originated from Shirae in Ooi's small character.

② Ishikawa-ken Komatsu-shi Originated in Shirae town. A place name with a record since the Kamakura period.

③ Ishikawa-ken Birth of Kahoku-shi white owl (siloo). In the Kamakura period there is a place name with a record of "white raw". "White" is used from the shop name of Shirao shop from the same place.