Why are the majority of the NPCs names of Japanese or Indian origin?

the game doesn't create random sims by ethnicity so it's not going to be able to name people based on a perceived ethnicity. It's just a 100% random roll of the dice looking at the whole pool of available options.

@sam123 what exactly is an "ethnically neutral name?" I assume you mean white people names. not sure white washing all the names is the same thing as being "neutral"