Surname Ranaghan (Ranaghan 
) , all over the world, is a rare last name. The surname Ranaghan is habitual in Ireland, where it is a rare surname, the United Kingdom, where it is a very rare surname, and India. Not in comparison with a country's population, it most frequently occurs in India, the United States, and the United Kingdom. Very seldom, Ranaghan is the forename as well as the last name.
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| Ranaghan | Canada, Ireland, United Kingdom, United States, India |
| kevin ranaghan American religious scholar, US (b. 1940) |
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| amanda ranaghan candidate in the 2021 Scottish Parliament election |
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| dorothy ranaghan American catholic leader |
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| matthew j ranaghan researcher |
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