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The Most Common Surname in Each Country (5000 × 4611)
(web.archive.org)
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They are all different pronunciation of the Chinese word 陳. Chen usually is besed off of the Mandarin way, Chan is Cantonese, and Tan is Hokkin, another Chinese dialect commonly spoken in Singapore.
https://en.wikipedia.org/wiki/Chen_%28surname%29?wprov=sfla1
Super fascinating — thank you!