Family name Hillegass (Hillegass 
) , in the world, is a rare cognomen. The family name Hillegass is characteristic of the United States, where it is a rare surname, New Zealand, and Argentina, where it is a very rare surname.
| VARIANT | COUNTRY |
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| Hillegass | New Zealand, Argentina, Canada, United States |
| clifton hillegass American businessman (b. 1918) |
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| aaron hillegass American writer, US (b. 1969) |
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| william b hillegass researcher |
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| gabe hillegass researcher ORCID ID = 0000-0002-1559-4046 |
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