A numismatist.
A numismatist studies the art and history of coins and coinage. Someone who just collects them is just a collector.
Numismatist
You call someone that studies metal a metallurgist.
A physicist.
A numismatist is someone who collects coins and/or medals a numismatist
a person who studies planets is a planetologist.
There is no special name for someone who studies Hebrew.
A Zoologist
An Anthropologist.
malacologist
euclidist
Gemologists