Family name Mcnelly (Mcnelly 
) , throughout the world, is quite a rare cognomen. The surname Mcnelly is characteristic of the United States, where it is a rare surname, New Zealand, and the United Kingdom. Not in comparison with a country's population, it is the most numerous in the United States, the United Kingdom, and Canada.
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| Mcnelly | Australia, Canada, New Zealand, United Kingdom, United States |
| john mcnelly American politician – Minnesota -House 1875-76 (District 1); Senate 1877-78 (District 1); House 1889-90 (District 1), US (b. 1830) |
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| leander h. mcnelly Confederate Army officer, US (b. 1844) |
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| william e. mcnelly American politician – Minnesota -House 1923-24 (District 1), US (b. 1857) |
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janice l. mcnelly victim of the COVID-19 pandemic: Served as the Iowa president of the League of Women Voters., US (b. 1941) |
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| theodore mcnelly university professor of Government and Politics (b. 1919) |
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| jack mcnelly American male curler and coach (1949-2020), US (b. 1949) |
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| nicki mcnelly British Anglican priest, GB (b. 1962) |
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| dale mcnelly college basketball player (1966–1966) Maine |
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| rod mcnelly college basketball player (1979–1982) Indiana State |
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| lester b. mcnelly entomologist (died 1972) |
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