Obscure Camera Stuff

So, who invented Camera Obscura? Some articles I stumbled across say it was this guy, and at least one article I've read attributes the name not to latin, but to the Arabic qamara, for dark room or private room. It's interesting that the overwhelming number of etymology entries for camera I found online refer to 16th century latin, and the same holds for entries on the invention of Camera Obscura as well.

I wonder if the Finnish kamara for a small room has any relation.