Last name Trettel (Trettel 
) , around the world, is quite a rare cognomen. The last name Trettel is characteristic of Argentina, where it is a rare surname, Brazil, and the United States. Very seldom, Trettel is the forename as well as the last name.
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| Trettel | Germany, Italy, United States, Argentina, Brazil |
| giulio trettel Italian Salesian and Church historian (1930-), IT (b. 1930) |
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| efrem trettel (b. 1921) |
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| lidia trettel Italian snowboarder, 2002 Olympic bronze Giant Slalom, IT (b. 1973) |
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| stephen jerome trettel academic |
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| steve trettel Ph.D. University of California, Santa Barbara 2019 |
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| flavia trettel researcher ORCID ID = 0000-0002-7983-2955 |
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| sean trettel researcher |
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| adam trettel GB |
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| antonio trettel |
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