Thread:Gokyr586/@comment-985184-20170708020741/@comment-985184-20170708090351

It's not uncommon for alternate Japanese spellings to occur. An example within the franchise is "Mars" (マーズ Māzu /  マルス Marusu), the former being used as one of Meteor's attacks and the latter used for Kamen Rider Mars' name... said alternate spelling is why I think his name got romanized as Mars instead of Malus since he has a lot more to do with Malus in terms of motif. Wiki's gotta go by its own rules of official romanizations though.

But yeah, if the Kyarenshī spelling is something you're seeing as often as Karenshī, it's just as valid and probably just a color/colour kind of difference. I would definitely write it less as a statement of fact and more like "It's believed his name is derived from ___".