The fun part is not the geographic origin, but those tests where people suddenly discover a dozen half-siblings they knew nothing about because Dad was a sperm donor 40 years back.
Had the same thing happen to a guy I have known almost 50 years. I knew both his parents, we knew his dad (a musician) got around. Apparently mom did too while dad was away. He stopped over on his way back to Texas after meeting up with his "new" family over in St Pete. Conversation was awkward at times. I ain't doing it. All 4 of my grandparents came from the same little town in Italy. Good enough for me. Joe