Japan
YES WE USE ENGLISH IN OUR GAMES BECAUSE WE ARE HIP AND SAVVY! HERRO!

America
Obviously they had to add the Castlevania title for brand recognition, and 'Bloodlines' actually ties into the storyline in a slightly clever way.

Europe
Like it always was back in those days, Europe got the pansy version with all the offensive things like blood and the actual word 'blood' removed. They also didn't smile upon the word 'ninja.' What the hell?