A relative of mine acquired a samurai sword during WWII. Is it possible to find the original owner?

It was always a dream of my great-uncle to return the samurai sword that he got while he was in Japan. He has since passed and I would like to help return this sword to its rightful owner. Is there any way to do that?|||Does it have a name on it? If not, well.........|||Contact the Japanese Embassy or Consulate in the Philippines would be the first place I would go.|||If there is no name, just keep it or sell it and keep the money. I would sell it without flickering