This was already asked for in Rename the Community user on localized sites and marked completed, but it wasn't implemented on these sites for some reason; this is therefore a bug with its implementation.
There isn't really an "implementation" here - all that was done was the Community user's display name and bio was manually edited by someone on those sites. It was simply never brought up on the other two sites, so it was never done. That's not really a bug, just a lack of people caring in those places.
I've changed it on the Russian Language site to match that of Stack Overflow in Russian. I wouldn't have the slightest clue what the corresponding name would be in Japanese. That's something to bring up on SO in Japanese so they can discuss what is best and whether it makes sense to change the name.