Surname Caplin (Caplin 
, Цаплин 
) , around the world, is quite a common cognomen. The last name Caplin is habitual in Russia, where it is quite a rare surname, Ireland, where it is a rare surname, and Kazakhstan. Measured by absolute frequency, it is commonest in Russia, Indonesia, and the United Kingdom. Much less frequently, Caplin is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Caplin | United Kingdom, Indonesia, Canada, United States, France |
| Цаплин | Kazakhstan, Belarus, Kyrgyzstan, Russia, Armenia |
| roxey ann caplin British writer, CA (b. 1793) |
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| sarah caplin British television producer, GB (b. 1901) |
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paul caplin British musician and entrepreneur, GB (b. 1954) |
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andrew caplin British economist (b. 1956) |
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thomas caplin Norwegian conductor (b. 1960) |
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| elliot caplin writer, US (b. 1913) |
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| ruth sacks caplin American screenwriter, philanthropist, fashion designer (1920-2014), US (b. 1920) |
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| arnold s. caplin American record producer (1929-2009), US (b. 1929) |
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| jean caplin British swimmer, GB (b. 1930) |
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| william caplin music theorist, US (b. 1946) |
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raymond caplin (b. 1990) |
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| anthony caplin Chairman, North West London Hospitals NHS Trust, 2008–13 (b. 1951) |
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| ivor caplin British politician (born 1958), GB (b. 1958) |
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| nicholas caplin British Army general, GB (b. 1958) |
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| carole caplin Health and wellness writer (b. 1962) |
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