The Japanese surnames etymology dictionary.
② Good neighbor . Summary . Abbreviation of Fujiwara. "Fuji" is used because Shinran of the founder of Jodo Shinshu is a monk in the Kamakura period and tells Mr. Shinran Fujiwara's descendant. Hyougo-ken Kanzaki-gun Ichikawa-chou Meiji New surname by monk of Jodo-ji Temple in Kotani. 藤原 reference.