Board Thread:Consensus Track/@comment-1207741-20180902030231/@comment-1251315-20180903175124

Snapper2 wrote: Sajuuk mentioned that Janin is not translated "randomly". That should be remedied. Not sure if it can. In the dub, characters randomly interchange between saying "Evil Three Ninja", "Evil Ninja" and even just saying "Janin" around the point when Jiga gets introduced in the arc. So various names for basically the same thing are used which is confusing.

It's also spoken that way directly by the voice actors, so even if it could be translated, changing the name would be confusing to viewers for no beneficial reason.
 * Hachō Village, which can't be translated further because it uses katakana.