Surname Deniz (Deniz 
, Дениз 
, دينيز 
) , worldwide, is a common cognomen. The surname Deniz is habitual in Turkey, where it is quite a common surname, Azerbaijan, and North Macedonia. In absolute terms, this name is the most popular in Turkey, Spain, and Mexico. Likewise, Deniz is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Deniz | Azerbaijan, Spain, Mexico, Turkey, Germany |
| Дениз | Bulgaria, Kyrgyzstan, Russia, Kazakhstan, Ukraine |
| دينيز | Morocco, Saudi Arabia, Algeria, Iraq, Egypt |
| Дэниз | Russia, Kyrgyzstan |
| galip deniz Turkish politician, TR (b. 1881) |
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| mehmet sadık deniz Turkish politician, TR (b. 1892) |
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| esma deniz first graduate Turkish nurse, TR (b. 1902) |
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| galip deniz Turkish politician (Gaziantep), TR (b. 1902) |
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| clara deniz British pianist, GB (b. 1911) |
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| francisco deniz Deniz, Francisco Antonio [Frank] (1912–2005), guitarist and bandleader (b. 1912) |
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| hüseyin deniz Turkish politician, TR (b. 1912) |
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| jose deniz Deniz, José William [Joe] (1913–1994), guitarist (b. 1913) |
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serdar deniz Turkish actor, TR (b. 1969) |
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| mehmet kemal deniz Cypriot politician, CY (b. 1920) |
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| mahmut deniz TR (b. 1911) |
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| laurence deniz Welsh guitarist (b. 1924) |
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| orhan deniz TR (b. 1914) |
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i̇smail deniz German-Turkish actor, DE (b. 1979) |
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| osman deniz TR (b. 1922) |
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