Aoto 【青砥】5 The Japanese surnames etymology dictionary.
② Good neighbor . Occupation . From a blue shop named after a dyeing company. Kouchi-ken Takaoka-gun Shimanto-chou Tell the Taisho that they came from Wakayama-ken Wakayama-shi (Old: Nogusaki) from 1190 to 1199 (Year of the year).
* There is a transmission that Tokushima-ken came from Kinki district in 1541 (Astronomical 10 years).