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The Most Common Surname in Each Country (5000 × 4611)
(web.archive.org)
For the map enthused!
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Most interesting one I see quickly is Kim in the central asian countries I assume from the mass relocations/deportations of ethnically Korean soviet citizens to central asia during WW2 and a more diverse set of names in central asia.
Adjacently, half (!) of South Koreans’ surnames are one of Kim, Lee, Park, or Jung.