This name makes me shudder. It's a terrible name. It sounds too harsh despite the "ina" ending. It's too close to Rufus. I always think of an old, dirty hound. The name sounds backwoodsy. It depresses me.
I think this is a great name, it would be great for a red-haired little girl's name, as Rufina means "red" or "red-haired" ("red-haired beauty"). I can see this name being used in the English language in the future, due to its meaning. :)