Etymology and distribution of 洪楊.

Kouyou 【洪楊】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Hiroshima-ken , Okayama-ken , Yamaguchi-ken .

① Hiroshima-ken Mihara-shi Kui Town Shimotsu (Old: Sadamori name) birthplace. Place name with a record in 1598 (Keioi 3 years). It is distributed in the same place.

② Personal name . A variant of 貞盛 . Okayama-ken Mimasaka-shi In Shimokayama, tell her that she came back from the southwestern part of Hyougo-ken (formerly Harima Country) after the battle of Komaki and Nagakute in 1584 (Tensho 12 years).