I know a couple of Khoisan-Native American girls (sisters) and a Khoisan-Maori guy. Which seems like a pretty weird mix even to this Anglo-Dutch-Indian-Khoisan guy.
Japanese/German She looks Indian.
I met a very nice 1/2 Malay, 1/4 English, 1/4 Maori girl a while back- any good? 
I’m Salvadoran and 1/8 Irish, with maybe a bit of Middle Eastern or some other Mediterranean ethnicity in there, not sure - my brother and I look vaguely Armenian. My daughter’s father is a mix of Polish, German, Irish and Russian Jew. So, does my daughter win? Or maybe my nephews, whose mom is Italian-American and Irish-American.
There were blacks who fought for the Confederacy, as well as black slave owners. That was surprising to me too.
I lived briefly in the Four Corners region, and Zuni/Navajo intermarriages (or, more commonly, inter-reproducing - almost all of their babies were born out of wedlock) were a matter of crossing a huge cultural divide even though the reservations were next to each other and many members of each tribe lived on the other reserve.
As for Tongan/Kazakh, can’t think of one, but I did see a PBS show recently about a Ukrainian woman who opened up her home to black Ukrainian orphans. How did this happen? There are several African nations who send large numbers of students to (mostly) medical school in Ukraine, and as one person said, “They have very active social lives with the native girls.” Because of cultural constraints, they rarely marry, and in fact the babies are usually left at orphanages or even not infrequently killed by the mothers. :eek: 
This program did have a father who found out he had a son, many years after the fact (IIRC, the boy was a teenager) and he came back to Ukraine to look for him, and one young man who found out his biodad was an American citizen. The show pretty much ended there.
I’ve heard of people leaving Amish orders to marry “English” people, although not the other way around. That would definitely be like moving to a foreign country.