Cognomen Sickler (Sickler 
) , all over the world, is quite a rare last name. The last name Sickler is habitual in the United States, where it is a rare surname, New Zealand, and Germany. Measured by absolute frequency, this name is the most popular in the United States, Germany, and Canada.
| VARIANT | COUNTRY |
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| Sickler | United Kingdom, France, United States, Germany, Canada |
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johann volkmar sickler German author, DE (b. 1742) |
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| friedrich sickler German historian, philologist and archaeologist, DE (b. 1773) |
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| josiah b. sickler (b. 1798) |
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| george sickler Umpire (1891-1964), ZA (b. 1891) |
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| don sickler American jazz musician, US (b. 1944) |
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| alfred julius sickler Estonian physician, NZ |
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| bill sickler college basketball player (1969–1971) Princeton |
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| jonathan sickler American politician |
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| robert sickler researcher ORCID ID = 0000-0002-9141-625X |
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| alma l. sickler American suffragist, US |
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| sheldon orvel sickler Ph.D. University of California, Los Angeles 1973 |
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| jefferson sickler American politician, US |
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| ryan sickler American stand up comedian |
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| bradley l. sickler (b. 1972) |
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| brett sickler American rower, US (b. 1983) |
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