Etymology and distribution of エドワード.

Edowādo* 【エドワード】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Kagoshima-ken Amami-shi , Oosaka-fu . There is Oka in the surname of Kagoshima-ken 's Amami archipelago. There is a word of "the first son". 岡 Oka reference.