You know what's nice about that site? Their algorithms are entirely invisible to someone that just stumbles across the site. I typed in the letter "s" into the prompt and got back something entirely static. Then I typed "s" again and got the same name again. Then I typed "a" and got a different name each time I typed "a" alone as my name.
So I don't know what it's actually doing with what we give it, but I'm sure curious how it works to "generate" those names. Like, I put "s" as my female Vampire name, and I get "Crepsley the Destroyer" over and over again. - You try it. See if you get the same thing.