Koumura 【幸村】5 The Japanese surnames etymology dictionary.
② Origin of Kyouto-fu Sogaku (Seoulak) County. A place name with a record since the Asuka period. Nara-ken Nara-shi The Meiji New surname using the place name by monk of Koitonin in Kofukuji Temple in Shogendo -cho. The place name also pronounced Sagara.