Why "Oscar" Wilde?

[Floater]

I read in an article about Oscar Wilde the other day that he was named so by his poet mother inspired by The Works of Ossian by James McPherson, but the story as I have heard it before is that his father came up with the name in honour of the, I don't remember which of the two, king of Sweden called Oscar, who had consulted him as an eye doctor on the advice of queen Victoria. Of course king Oscar I was himself named after Ossian but that's another story. So how did it happen? The mother variant, the father/king Oscar variant or a combination of the two?