Last name Halladay (Halladay 
) , across the world, is quite a rare family name. The last name Halladay is habitual in Canada, where it is quite a rare surname, New Zealand, where it is a rare surname, and the United States. Measured by absolute frequency, it is commonest in the United States, Canada, and the United Kingdom.
| VARIANT | COUNTRY |
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| Halladay | United Kingdom, Israel, United States, Canada, New Zealand |
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daniel halladay American businessman (1826-1916), US (b. 1826) |
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milton r. halladay editorial cartoonist (1874-1961), US (b. 1874) |
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| frayer halladay American politician, US (b. 1846) |
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| howard hadden halladay Canadian politician, CA (b. 1876) |
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| death halladay American football player (1900–1988), US (b. 1900) |
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| eric halladay British historian (b. 1930) |
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| jacqueline halladay researcher (ORCID 0000-0002-1300-353X) |
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| alycia halladay researcher |
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| lindsay r halladay researcher |
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| a halladay researcher |
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| jillian halladay researcher |
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| christopher halladay researcher |
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| curtis halladay Canadian rower, CA (b. 1995) |
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