[quote=Peace Keeper]
The problem isn't names in general, but rather how they behave within their given regions. Problem is, most certainly, the fact that Japanese like culture is far too different from the one which I use. The largest problem is probably the fact that culture spreads beyond nation lines, as well.
[/quote]

My culture is pretty different from its surrounding cultures as well. They worship nameless Gods, trace ancestry matrilinearly, and have no concept of marriage for example. In your case, it could possibly be explained that the Japanese-esque culture's ancestors and your culture's ancestors originated in different regions and thus don't share common roots.