Family name Ricklefs (Ricklefs 
) , around the world, is quite a rare last name. The cognomen Ricklefs is habitual in Germany, where it is a rare surname, the United States, and Australia, where it is a very rare surname. In absolute terms, this name is the most popular in the United States, Germany, and Canada.
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| Ricklefs | United Kingdom, Australia, United States, Germany, Canada |
| friedrich reinhard ricklefs German classical philologist and high school teacher (1769-1827), DE (b. 1769) |
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robert ricklefs American ornithologist, US (b. 1943) |
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| jürgen ricklefs DE (b. 1900) |
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| merle calvin ricklefs Australian historian, US (b. 1943) |
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| ulfert ricklefs DE (b. 1934) |
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| harald ricklefs (b. 1935) |
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| roger ricklefs (b. 1940) |
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| chad ricklefs American ultramarathon runner, US (b. 1967) |
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| sven ricklefs (b. 1962) |
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| bettina ricklefs GB (b. 1967) |
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| stacy ricklefs researcher |
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| franz l ricklefs researcher |
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| marcel ricklefs researcher |
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| aagje-katharina ricklefs DE |
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