I'm pretty it was just Hasbro who decided all of the names since they're the ones producing the merchandising and acquiring the trademarks. It's clear he was just a generic Seeker, not actually Starscream himself. Even Knight that this is not Starscream but he looks like Starscream because all of the Seekers were pretty much a clone of him. Unfortunately, someone gave him a bad name (probably Hasbro). Shatter and Dropkick were called Decepticon Rangers in the concept art and the fact that their names weren't said in the film supports the theory that the names were decided later on, not when they had designed these characters. If we ever see a concept art of Blitzwing that says something generic like "Seeker", that would verify my theory.