Sekihara 【関原】5 The Japanese surnames etymology dictionary.
① Ooita-ken Bungotakada-shi Originated from the neighborhood of Watarase (formerly Susanna name). A place name with a record in the Warring States Period. It was in the Edo era at Ooita-ken Bungotakada-shi Tamatsu in the Sengoku period. There is masculinity in the name of male.
② Toyama-ken Toyama-shi Originated from the vicinity of Wakanakamachi Noritsunin (formerly Shimizu). A place name with a record since the Warring States Period. It is distributed in Toyama-ken Toyama-shi . Toyama-ken Toyama-shi I tell him that he was using the shopkeeper in the Edo period in Suwa-cho, Yao-machi.