C is a bit of a free-for-all with case, but some languages have well-established conventions for this. E.g. type names are almost always CamelCase in Haskell,

C is a bit of a free-for-all with case, but some languages have well-established conventions for this. E.g. type names are almost always CamelCase in Haskell, and the compiler requires the first letter be a capital. If there's a convention already, I mostly just try to follow it.