The Japanese surnames etymology dictionary.
Hyougo-ken , Oosaka-fu . Originated from Tsudomon of Hyougo-ken Nishinomiya-shi . A place name with a record since the Heian period. The place name was also written as "Tsudo". Oosaka-fu Northern · Hyougo-ken Southeastern part (formerly Settsu national) had the name of the head of Tsubadoku in the Heian period.