Etymology and distribution of 淨原.

Kiyohara 【淨原】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Toukyou-to , Ibaraki-ken Shimotsuma-shi · Ooita-ken Bungotakada-shi .

① It tells from the place name of Kotomaru (Old: Karumaru) which was near Ibaraki-ken Mito-shi (formerly Yoshida village). Period, location unknown. Ibaraki-ken Shimotsuma-shi It was in the Azuchi-Momoyama period as a vassal of Mr. Taga Tani who was the castle owner of Shimozuma Castle in Honjo-cho.

② Ooita-ken Bungotakada-shi Originated from the waterside (old: Kuman). A place name with a record in the Warring States Period. It was the notation of "Hong Kong" in the same era during the Warring States Period. It is unknown whether it will exist.