Hiraku 【平工】4 The Japanese surnames etymology dictionary.
Okayama-ken . Terrain . From the field and the favorite "light". Okayama-ken Okayama-shi Ashiko was in the Edo period in the Ashigara clan of the clan office. Okayama-ken Okayama-shi Tell him that he was engaged in agriculture in Kita Ward Otida. Estimated in the Edo period.