Surname Rettger (Rettger 
) , globally, is a rare last name. The cognomen Rettger is habitual in the United States, where it is a very rare surname, Canada, and New Zealand.
| VARIANT | COUNTRY |
|---|---|
| Rettger | Brazil, New Zealand, United States, Canada |
| george rettger American baseball player, US (b. 1868) |
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| leo frederick rettger botanist (b. 1874) |
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| leo frederick rettger (b. 1874) |
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| ernest william rettger Ph.D. Clark University 1898 |
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| robert ernest rettger |
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