Last name Deehan (Deehan 
) , around the world, is quite a rare cognomen. The surname Deehan is characteristic of Ireland, where it is quite a rare surname, the United Kingdom, where it is a rare surname, and New Zealand. Measured by absolute frequency, it most frequently occurs in the United Kingdom, the United States, and Ireland. Much less frequently, Deehan is the forename as well as the last name.
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| Deehan | Ireland, Australia, Bangladesh, United States, United Kingdom |
| geoff deehan British film and TV producer, GB (b. 1952) |
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| john deehan English footballer and manager (born 1957), GB (b. 1957) |
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| mark a deehan researcher |
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| josephine deehan Northern Irish election candidate |
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| gertrude louise deehan Peerage person ID=431349 |
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| maureen r deehan researcher |
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| bill deehan college basketball player (1972–1973) Connecticut |
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| david j deehan researcher |
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| gerald a deehan researcher (ORCID 0000-0002-9211-2610) |
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