There is no special name for someone who studies Hebrew.
A Hebrewist.....and when they become a Hebrewmaster.
You call someone that studies metal a metallurgist.
A physicist.
a person who studies planets is a planetologist.
An Anthropologist.
malacologist
euclidist
Gemologists
psychologist
A numismatist.
A Zoologist
a meteorologist.
An economist