Because I don't want to go offtopic, I'll post this here. The reason why Enix registered the games as Dragon Warrior in the US until the release of VIII is because there was a "DragonQuest" trademark in place here. To avoid lawsuits, they chose Dragon Warrior instead, even though they hd intended the series to retain its original name.
Case-in-point, it's still Dragon Quest, and I refuse to call any of the games Dragon Warrior.