Parameter naming: filename or fileName?

Question

I try to be grammatically correct in my naming*. I\'ve always used filename instead of fileName. The java convention also seems to use this, but

Answer 1

Isn't the obvious answer that FxCop is an automated tool? It recognizes that "name" is a word, so it suggests starting it with a capital N. We happen to know that "filename" is also a word, and so only the first F should be capitalized.