He was originally called Bruce Banner but somewhere early on Stan Lee wrote "Bob Banner" by mistake in either Incredible Hulk (1st series) or The Avengers (I forget which). Eventually the error was caught but not before some minor confusion. So his name, retroactively, became Robert Bruce Banner. When the TV show with Bixby and Ferrigno came around, they changed his first name to David since "Bruce" is sometimes perceived as a "gay" sounding name. Go figure...
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