Cognomen Demartino (Demartino 
) , in all the world, is quite a rare surname. The last name Demartino is habitual in Malta, where it is quite a rare surname, Uruguay, and Italy. Measured by absolute frequency, this name is the most popular in the United States, Italy, and Argentina.
| VARIANT | COUNTRY |
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| Demartino | Argentina, Italy, Brazil, United States, Uruguay |
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nick demartino American businessman (b. 1948) |
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| richard demartino American contract bridge player, US (b. 1939) |
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| jesse demartino American photographer (born 1973), US (b. 1973) |
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| jessica k demartino researcher |
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| cristoforo demartino researcher |
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| anthony w demartino researcher (ORCID 0000-0001-5303-5758) |
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| frank demartino college basketball player (1970–1970) St. Francis (NY) |
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| randall r demartino researcher |
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| amanda magalhães demartino researcher |
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| julie a demartino researcher |
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| linsay demartino United States academic |
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| george demartino |
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| gabi demartino American YouTuber, singer, US (b. 1995) |
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