Cognomen Jettmar (Jettmar 
) , across the world, is a rare surname. The surname Jettmar is characteristic of Czechia, where it is a rare surname, Austria, and Poland, where it is a very rare surname. In absolute terms, it is the most numerous in Poland, the United States, and Germany. Also, Jettmar is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Jettmar | Germany, Czechia, Austria, United States, Poland |
| josef bernard jettmar CZ (b. 1798) |
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| josef jettmar Czech chemist (1855-1922), CZ (b. 1855) |
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| rudolf jettmar Austrian painter and printmaker (1869-1939), AT (b. 1869) |
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| heinrich manfred ritter von jettmar Austrian physician, bacteriologist and university teacher (b. 1889) |
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| karl jettmar Austrian archaeologist and prehistorian, AT (b. 1918) |
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| jacek jettmar PL (b. 1936) |
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| josef jettmar (b. 1954) |
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