Aiki 【四十木】2 The Japanese surnames etymology dictionary.
Aichi-ken , Chiba-ken , Gunma-ken . A variant of 愛甲 . There is a record of Mr. Aiko at the Gifu-ken · Aichi-ken in 1754 (4th year of honorical calendar) to 1755 (5th year of Boryeo) treasure calendar. Kumamoto-ken Kumamoto-shi Chuo-ku Honmaru was in the Edo era at the Kumamoto clan in the Clan office. 愛甲 reference.