The prefix "crypto" means hidden or disguised in English. Neither cryptocurrency nor cryptography have a monopoly on it. The way people get exercised about this issue you'd think that "cryptography" is the only word in the English language to use the prefix "crypto-".
The thing is that cryptocurrency is really a niche application of cryptography, where cryptography is very broadly used. So it's a little like if people started using "petroleum" to mean petroleum jelly. Sure, nobody is aware of cryptography's effect on their life. But it is a key ingredient in everything including cryptocurrency.
