Surname Calahan (Calahan 
) , across the world, is quite a rare family name. The last name Calahan is habitual in the United States, where it is a rare surname, New Zealand, and Philippines, where it is a very rare surname. Measured by absolute frequency, it most frequently occurs in the United States, Philippines, and Canada. Very seldom, Calahan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Calahan | United Kingdom, Philippines, United States, Canada, France |
| edward a. calahan American inventor, US (b. 1838) |
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| harold augustin calahan author (1889-1965), US (b. 1889) |
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sharon calahan American cinematographer, US (b. 1975) |
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| donald a calahan Ph.D. University of Illinois at Urbana-Champaign 1960 (b. 1935) |
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calahan skogman American actor and college basketball and football player, US (b. 1993) |
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| julie l calahan researcher |
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| cody calahan Canadian film director and film producer, CA |
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| o'brian calahan college basketball player (2006–2006) Alcorn State |
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| jenny k. calahan researcher |
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| christopher calahan researcher ORCID ID = 0000-0002-9631-8966 |
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| rebecca sue calahan Ph.D. Auburn University 1990 |
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| jeremy calahan football player (born 1983) (b. 1983) |
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