I believe it is supposed to be the fictional character Alan Quartermain from, among other books, King Solomon's Mines by H. Rider Haggard. The character was borrowed, along with other fictional characters from other writers, by Alan Moore as he wrote the Victorian Gothic graphic novel The League of Extraordinary Gentlemen*. This novel was the basis of the film you are refering to. So nicely spotted on ya!
* I am personally hoping that the next sequel is going to be called The League of Extraordinary Cads and Lechers.