The only people I've ever encountered using the "a (Japan|Chin)ese" construction were (Japan|Chin)ese people themselves. Which may have rubbed off on GGP from

The only people I've ever encountered using the "a (Japan|Chin)ese" construction were (Japan|Chin)ese people themselves. Which may have rubbed off on GGP from GGP's Asian spouse. I've wondered if there was some correlation in Asian languages, but the English translation of the Japanese version of that wiki page makes it seem as if the concept of demonym is foreign to Japanese readers: http://translate.google.com/translate?hl=en&sl=auto&tl=en&prev=_dd&u=http%3A%2F%2Fja.wikipedia.org%2Fwiki%2F%25E4%25BD%258F%25E6%25B0%2591%25E3%2581%25AE%25E5%2591%25BC%25E7%25A7%25B0 http://translate.google.com/translate?hl=en&sl=auto&tl=en&pr... (and there's no Chinese version, as far as I can tell).