John

 (sometimes nicknamed Johnny or Jack) is one of the most common names in the English language. It is the given name of various characters in the Teenage Mutant Ninja Turtles multiverse, as well as the given name of various non-fiction people involved in production.

Non-Fiction People

 * John Campbell, voice actor.
 * John DiMaggio, voice actor.
 * John Kassir, voice actor.
 * Johnny Knoxville, voice actor.