[WhatDoYouThink!]

I often met ppl who called themselves 旅美华人，旅加华侨，华裔科学家，。。。and some old Cantonese folks may call themselves tong yan, even if they'd already migrated long time ago. But never came across one who called himself 汉，except in mainland china and tw. There's aso a tw song entitled 愿嫁汉家郎