Speaking of aliases, June is credited as "
Atsushi Chikuma" in at least two games (PC-Engine Bomberman and Super Bomberman, perhaps others as well.) The same is true for
Jun Enoki, having been credited as "Atsushi Enoki" at least once.
As such I suspect it's an error in romanisation, though I don't know for sure. Eitherway, I though it a good idea to put Atsushi Chikuma under name variations, so that when searched it returns a result, and so people realise Atsushi & Jun = same person.