This isn't the only game of the series with stuff like that. Mega Man 3 had "Dr.Wiley", for instance. But yeah, that's a bad one. It's not a mere translation mistake (which could be attributed to a new translator not knowing how a name was translated in a previous game of a series). It's literally an improper grammatical mistake. And that's bad.
Also : http://img706.imageshack.us/img706/2852/jusdbegunn.jpg (But that's clearly on purpose.) --- "What kind of moron gets hit by a bus inside a shopping mall?" -Maria Torres, Trauma Team