Oga 【遠賀】2 The Japanese surnames etymology dictionary.
① Topography . From a small swamp. Tell the place name of Fukushima-ken western part (formerly Iwashiro country). Period, location unknown. Fukushima - ken Kitakata - shi Kumakura - cho Sincheon Konuma Koshi is a place name with a record since the Edo period. Fukushima-ken Iwase-gun Ten'ei-mura It was in Warring States period in Osato.