As "a tall white foreigner with a big nose" it's a pretty random tossup between someone introducing themselves in family name first order or family name last order, even when speaking Japanese. This occasionally leads to the awkward situation of not knowing how to refer to someone right after meeting them. I use "GivenName FamilyName" when speaking English and "FamilyName GivenName" when speaking Japanese. I assumed…
I only notice this in Japanese Anime and Movie DUP and I thought it was very strange. In writing in English, GivenName : FamilyName makes sense because that is how all English speaking countries work, but when you speaks it in that order, it all went off.
In Hong Kong most people have a Christian / English name so it isn't much of a problem. Although this tradition will likely erode away for obvious reasons.