If you are an American, and you know who baba yaga is, either your family is slavic, or you are into the occult. I bet the latter.
Or just somebody who knows how to google "baba yaga" and look in the wiki entry. I guess that is so beyond your intellectual capabilities that you can't imagine people being able to do it.
You are into the occult?
I have seen the name referred to in works of literature, from inference, she was a witch that ate babies, had a house that walked on feet and maybe had something to do with bears.
Usually she is mentioned by Russian characters referring to her as commonly know folklore.
What is the occult connection?