Family name Hillas (Hillas 
) , across the world, is a rare surname. The surname Hillas is characteristic of Australia, where it is a rare surname, the United Kingdom, and New Zealand. Not in comparison with a country's population, the name is most common in Australia, the United Kingdom, and the United States. Very seldom, Hillas is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Hillas | United Kingdom, Australia, Canada, United States, New Zealand |
| lorraine hillas Australian field hockey player, AU (b. 1961) |
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| patricia hillas Church of England priest, MY (b. 1966) |
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| samantha hillas British QC (b. 1972) |
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| elaine hillas researcher |
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| anthony michael hillas physicist |
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| john hillas game theorist, university teacher, AU |
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