The Japanese surnames etymology dictionary.
Nagano-ken . Variant of the 大日向 . Nagano-ken Nagano-shi Matsushiro Matsushiro was a clan of the clan, Mr. Matsushiro, Tokushima-ken Tokushima-shi Tokushima cho was in the Edo period in the Tokushima Samurai of the Clan office. The Tokushima clan says that the Nagano-ken Adzumino-shi near Kitaazumi-gun (old: Azuma-gun) comes from the large ocean . 大日向 reference.