Tomonaga 【友永】5 The Japanese surnames etymology dictionary.
Iwate-ken , Miyagi-ken , Kanagawa-ken . Summary . Abbreviation for Natsume. In Iwate-ken Oushuu-shi 's Esashi tell me that it was renamed with Miyagi-ken Kesen'numa-shi leaving Natsume's last name "summer". Estimated in the Edo period. 夏目 reference. It is distributed in Tottori-ken Kurayoshi-shi . Tottori-ken Kurayoshi-shi There is Natsutani (Natsutani) in the wild stamp of Wada.