Cognomen Joslyn (Joslyn 
, جوسلين 
, ג'וסלין 
) , globally, is quite a rare family name. The last name Joslyn is characteristic of the United States, where it is a rare surname, Jamaica, and Honduras. Not in comparison with a country's population, it is commonest in the United States, the United Kingdom, and Australia. More prevalently, Joslyn is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Joslyn | Democratic Republic of the Congo, United Kingdom, South Africa, India, United States |
| جوسلين | Syria, Palestinian Territory, Lebanon, Jordan, Iraq |
| ג'וסלין | Israel |
| hezekiah joslyn American physician and abolitionist (1797-1865) (b. 1797) |
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allyn joslyn actor, US (b. 1901) |
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william g. joslyn American Major General (1922-2011), US (b. 1922) |
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| marcellus l. joslyn American philanthropist, US (b. 1873) |
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| harold waddell joslyn Canadian airman, CA (b. 1893) |
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| evelyn p. joslyn (b. 1889) |
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betsy joslyn American actress, US (b. 1954) |
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cliff joslyn American scientist (b. 1963) |
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| roger joslyn English professional footballer (born 1950), GB (b. 1950) |
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| roger d. joslyn genealogist |
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| louis r joslyn researcher (ORCID 0000-0002-7260-6568) |
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| cliff a joslyn researcher |
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| benjamin f joslyn Gunsmith |
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| stephen k joslyn researcher |
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| andrew joslyn American composer |
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