Last name Cian (كيان 
, جهان , Cian 
) , in the world, is a common cognomen. The last name Cian is habitual in Iraq, where it is quite a common surname, Iran, where it is quite a rare surname, and Libya. In absolute terms, this name is the most popular in Iraq, Iran, and Argentina. Also, Cian is the forename as well as the last name.
| VARIANT | COUNTRY |
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| كيان, جهان | Iran, Iraq, Egypt, Palestinian Territory, Saudi Arabia |
| Cian | Taiwan, Argentina, Italy, Ireland, Malaysia |
| Cyan | Taiwan, United States, Indonesia, Malaysia, China |
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vittorio cian Italian politician, IT (b. 1862) |
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gilda cian Italian poet and writer, IT (b. 1894) |
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| fernand cian Italian sculptor (1889-1954), IT (b. 1889) |
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| giorgio cian Italian jurist (1935-), IT (b. 1935) |
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| luciano cian Italian presbyter, IT (b. 1939) |
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| liliana cian Colombian swimmer, CO (b. 1959) |
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| paolo cian IT (b. 1966) |
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| michel de cian particle physicist at University of Heidelberg |
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| anne de cian researcher (b. 1980) |
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| franco de cian researcher |
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| luca cian researcher |
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| ramiro luna cian researcher (ORCID 0000-0001-5236-3717) |
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| enrica de cian economist (Fondazione ENI Enrico Mattei (FEEM)) |
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| raúl esteban cian researcher |
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