Cognomen Gagg (Gagg 
) , around the globe, is a rare surname. The last name Gagg is habitual in Switzerland, where it is a rare surname, the United Kingdom, and Ireland. Not in comparison with a country's population, this name is the most popular in the United Kingdom, Germany, and the United States. Much less frequently, Gagg is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gagg | Germany, United Kingdom, Switzerland, United States, Brazil |
| gebhard gagg DE (b. 1802) |
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| gebhard gagg Swiss painter, CH (b. 1839) |
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| hermann gagg CH (b. 1835) |
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| adolf gagg CH (b. 1858) |
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| james gagg researcher |
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| walter gagg lawyer, DE |
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| richard gagg |
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