Family name کوثری (Kosari 
, کوثری ) , worldwide, is quite a rare surname. The cognomen کوثری is habitual in Iran, where it is a rare surname, Slovakia, and Hong Kong. Measured by absolute frequency, it most frequently occurs in India, Iran, and Indonesia. Likewise, کوثری is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kosari | Iran, Greece, Indonesia, United States, India |
| کوثری | Iran |
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عبدالله کوثری Iranian poet and translator, IR (b. 1946) |
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جهانگیر کوثری Iranian film producer, IR (b. 1952) |
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اسماعیل کوثری Iranian politician, IR (b. 1955) |
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فریبا کوثری Iranian actress, IR (b. 1966) |
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| کوثری همدانی Iranian poet, IR |
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| مسعود کوثری Iranian translator, IR |
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