Worldwide, Giammarco (Giammarco 
, ジャンマルコ) is quite a rare principally boy's, but scarcely girly forename. The first name Giammarco is habitual in Italy, where it is quite a rare primarily boy's, but very infrequently girly name, and China, where it is an extremely rare boy's name. Also, Giammarco is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Giammarco | Canada, Italy, Australia, United States, Argentina |
| giammarco frezza Italian footballer, IT (b. 1975) |
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| giammarco cascino Italian psychiatrist, IT |
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| di giammarco photographer |
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| giammarco raponi researcher ORCID ID = 0000-0002-9665-0811 |
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| giammarco collemi researcher |
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| giammarco caradonna researcher (ORCID 0000-0002-7752-3198) |
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| giammarco mocci |
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| giammarco menga Italian sports journalist, IT (b. 1990) |
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| giammarco storani volleyball player, IT |
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| giammarco vindice volleyball player, IT |
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