...sounds like a dynamic name for a new S-F/superhero book.
Something Jim Lee or John Byrne would draw.
Etymology isn't my expertise, but Trans is the same root as Transition and Transport. If you know Latin (I don't), you may have heard about Gallia cisalpina / Gallia transalpina. Trans means "across", "beyond" or "on the opposite side". Cis means "on the same side [as]" or "on this side [of]". (Source: Wikipedia & members of a another forum).
So one could claim that Kurt Wagner/Nightcrawler and Jon/Doctor Manhattan are trans, in one meaning of the prefix...