Might be different in the US, in Europe it's not too uncommon to talk about calvinists, particularly in certain countries like the Netherlands it's a well-established term (which is even used there to describe Dutch behavioral culture, because it's deemed to be so fitting), and separate from other forms of protestantism.

Calvinists get plentifully referenced in general circles when you grow up in Geneva ;)

I received a protestant education and as such Calvinism is part of the curriculum.