I always just thought it was to make the introduction more elegant, as in "Here's the fancy-pants new installation of Castlevania, folks." As stated, it says Dracula X in the Japanese version, which was to indicate that here's the second game in the sub-series, a direct continuation of Rondo of Blood. I guess in that sense the Japanese title has more meaning, but it still worked in my mind to just see the westernized title.