Consider the hydrate below. fecl3•6h2o

So this is nomenclature.
The name would be Iron (III) Chloride Hexahydrate
Reason why it's Iron (III) is because of the 3 after Cl, if you take FeCl3 apart it's  and Cl^-.
Hexahydrate because hexa = 6 and hydrate=water

The term hydrate would be wrong because that clearly doesn't come first

It would be the anhydrous compound that comes first. The "an" in "anhydrous" means "without". Hydrous=water, so anyhdrous= without water
The part without water is FeCl3. The water is 6H2O

The prefix for the coefficient of water is 6, or hexa, but that's not first in the name

It dont even matter because at the end of thre day we gone life like it ius s