Surname Hilgard (Hilgard 
) , across the world, is a rare cognomen. The cognomen Hilgard is habitual in Czechia, where it is a rare surname, Germany, where it is a very rare surname, and Honduras. Measured by absolute frequency, it most frequently occurs in Czechia, Germany, and the United States. Also, Hilgard is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Hilgard | Germany, Czechia, South Africa, United States, Tanzania |
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julius hilgard United States engineer (1825-1890), DE (b. 1825) |
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eugene woldemar hilgard American geologist (1833-1916), US (b. 1833) |
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| theodor hilgard German lawyer, DE (b. 1790) |
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| friedrich hilgard (b. 1784) |
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karl emil hilgard Swiss engineer and professor at ETH Zurich, CH (b. 1858) |
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| eugene waldemar hilgard entomologist (born 1833) (b. 1833) |
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| alfred hilgard (b. 1857) |
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| eduard hilgard DE (b. 1884) |
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| ernest hilgard American psychologist (1904–2001), US (b. 1904) |
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| josephine rohrs hilgard psychologist, US (b. 1906) |
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| hanns hilgard (b. 1912) |
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| stanislav hilgard CZ (b. 1943) |
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| joseph hilgard researcher (ORCID 0000-0002-7278-4698) |
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| philip hilgard researcher |
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