Taphophilia: an abnormal love for graves and cemeteries.
Taphophile: one who has a passion for and enjoyment of cemeteries.
An Archeologist might fit into this category - depending on how old/ancient the gravesite is.
Sexton
You call someone that studies metal a metallurgist.
A physicist.
a person who studies planets is a planetologist.
There is no special name for someone who studies Hebrew.
A numismatist.
A Zoologist
An Anthropologist.
malacologist
euclidist
Gemologists
psychologist
A Technologist. :)