"Dihydrogen monoxide" is NOT the chemical name of water. It is a joke name made up by people who know a little chemistry, but not much.

I have a degee in chemistry, including graduate work and experimental research, and NO ONE in that profession EVER calls water dihydrogen monoxide. They call it "water". If it were to be named according to its constituent elements, it would be called "hydrogen oxide" - but it's not. It's referred to as "water".