Cognomen Cotsen (Cotsen 
) , in the entire world, is a very rare family name. The surname Cotsen is characteristic of the United Kingdom, where it is a very rare surname, New Zealand, and Thailand, where it is an extremely rare surname. In absolute terms, it is commonest in the United Kingdom, the United States, and Thailand.
| VARIANT | COUNTRY |
|---|---|
| Cotsen | New Zealand, United States, United Kingdom, Thailand |
| lloyd cotsen American collector, philanthropist, and businessman, US (b. 1929) |
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