Family name Drennan (Drennan 
) , around the globe, is quite a common surname. The last name Drennan is characteristic of Ireland, where it is quite a rare surname, Australia, and the United Kingdom. Measured by absolute frequency, it is commonest in the United States, the United Kingdom, and Australia. Very seldom, Drennan is the forename as well as the last name.
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| Drennan | United Kingdom, Australia, Ireland, United States, Canada |
| thomas drennan Irish Presbyterian minister (b. 1696) |
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| william drennan Irish poet, physician and political activist, GB (b. 1754) |
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| frederick drennan (1779-1837) public servant (b. 1779) |
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| john swanwick drennan Irish poet (b. 1809) |
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| william drennan, jr. (b. 1802) |
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| samuel drennan Canadian politician (1819-1882), CA (b. 1819) |
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| james m. drennan deputy sheriff and chief of police in Worcester, Massachusetts, US (b. 1834) |
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alexander murray drennan Scottish pathologist (b. 1884) |
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| william melville drennan Canadian politician, CA (b. 1853) |
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| thomas j. drennan American Fire commissioner (b. 1877) |
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john drennan Australian cricketer, AU (b. 1932) |
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| matthew robertson drennan British-South African anthropologist and anatomist (1885-1965), GB (b. 1885) |
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| mary fletcher drennan American suffragist, US (b. 1890) |
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| alexander drennan Labourer, trade unionist, communist, watersider (1899-1971), NZ (b. 1899) |
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| john cherry drennan Northern Irish politician (b. 1899) |
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