The article is BS. Samantha was used long before Bewitched. I forget the name of the series but there was a series of books in the late 1800's featuring a character named Samantha. We talked about it in school briefly. The one title I remember is "Samantha On the Race Problem" and the books were supposed to be social commentary.
Katniss was made up for the Hunger Games. Samantha and Bella are not made-up names.