Family name Magennis (Magennis 
) , worldwide, is quite a rare cognomen. The cognomen Magennis is characteristic of Ireland, where it is quite a rare surname, the United Kingdom, where it is a rare surname, and Australia. Not in comparison with a country's population, it is the most numerous in the United Kingdom, the United States, and Ireland.
| bonaventure magennis Roman Catholic bishop (b. 1595) |
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| arthur magennis Magennis, Arthur, third Viscount Magennis of Iveagh (1623/1626–1683), army officer (b. 1620) |
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| margaret magennis, viscountess iveagh (died 1744) (b. 1673) |
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william magennis Irish politician and academic, IE (b. 1867) |
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| bernard magennis - (1833 - 1911) (b. 1833) |
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| edward magennis Irish ophthalmologist and writer, GB (b. 1857) |
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james joseph magennis recipient of the Victoria Cross, GB (b. 1919) |
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stephen magennis U.S. Army officer, US |
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| eric magennis Australian Paralympic lawn bowls player and archer, AU (b. 1937) |
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josh magennis Northern Irish association football player (born 1990), GB (b. 1990) |
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| beverly magennis ceramic sculptor (b. 1942) |
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| william magennis Australian rower, AU (b. 1950) |
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| hugh magennis GB (b. 1946) |
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| evelyn magennis Peerage person ID=665546 |
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| ellen magennis Peerage person ID=342353 |
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