Family name Olcay (Olcay 
, Олджай 
) , in all the world, is a common cognomen. The cognomen Olcay is habitual in Turkey, where it is quite a common surname, Chile, where it is a rare surname, and Austria. In absolute terms, it most frequently occurs in Turkey, Germany, and Chile. More prevalently, Olcay is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Olcay | Germany, Australia, Chile, Turkey, Nepal |
| Олджай | Ukraine, Russia |
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kenan olcay Olympic wrestler, TR (b. 1913) |
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| osman olcay Turkish politician and diplomat, TR (b. 1924) |
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| şükrü olcay TR (b. 1914) |
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| emin olcay (b. 1946) |
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| sadi olcay Turkish basketball player, TR (b. 1957) |
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| şadi olcay Turkish basketball player (1957-), TR (b. 1957) |
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| zuhal olcay Turkish actress and singer, TR (b. 1957) |
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| bülent olcay Turkish politician, TR (b. 1960) |
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| hamit osman olcay (b. 1961) |
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| mehmet hakan olcay (b. 1962) |
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| catalina olcay Chilean actor, CL (b. 1974) |
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| lale olcay researcher (ORCID 0000-0002-5684-0581) |
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| b orkan olcay researcher (ORCID 0000-0003-3721-6756) |
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| ayhan olcay researcher |
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| serhan olcay researcher |
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