I'm new to the fandom and was wondering what is name for it is, for example I am also a Sherlockian.

First of all, welcome to the fandom :)
And, about the name, I'm not sure. I personally like the name Supernaturalist, but I also saw Wayward Son/Daughter.

i call myself a hunter

To be honest, I don't really think we have a name for ourselves, most just call us Supernatural Fans. However as a fandom-- a whole-- we are known as SPNFamily :)