Surname Trettin (Trettin 
) , in the world, is quite a rare cognomen. The last name Trettin is characteristic of Germany, where it is quite a rare surname, Denmark, where it is a rare surname, and the United States. In absolute terms, this name is the most popular in Germany, the United States, and Brazil.
| VARIANT | COUNTRY |
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| Trettin | Germany, Brazil, Canada, Denmark, United States |
| elke trettin badminton player, DE (b. 1936) |
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| hans peter trettin DE (b. 1927) |
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| ulrich trettin East German tennis player, DE (b. 1940) |
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| uwe trettin badminton player, DE (b. 1942) |
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| kaethe trettin (b. 1947) |
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| käthe trettin (b. 1947) |
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| jürgen trettin researcher |
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| carl trettin researcher ORCID ID = 0000-0003-0279-7191 |
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| bettina trettin researcher (ORCID 0000-0003-3851-7294) |
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| peter trettin Dr. rer. nat. Universität Rostock 1968 |
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| marika trettin German female curler, DE (b. 1983) |
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| simone trettin |
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| pierre hernandez trettin (b. 1984) |
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