Family name Mcilwaine (Mcilwaine 
) , across the world, is quite a rare surname. The cognomen Mcilwaine is habitual in Northern Europe, particularly Isle of Man, where it is quite a rare surname, the United Kingdom, and Ireland, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in the United Kingdom, the United States, and Australia.
| VARIANT | COUNTRY |
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| Mcilwaine | Canada, Australia, United States, United Kingdom, Ireland |
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richard mcilwaine American theologian, US (b. 1834) |
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william b. mcilwaine American politician, US (b. 1854) |
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henry read mcilwaine American librarian, US (b. 1864) |
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| william frederick mcilwaine (born 1843) (b. 1843) |
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| william st. john mcilwaine (born 1869) (b. 1869) |
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| cecilia lambert mcilwaine (born 1872) (b. 1872) |
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| helen mcilwaine (born 1873) (b. 1873) |
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| arthur arnold mcilwaine (born 1877) (b. 1877) |
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| william andrew mcilwaine (b. 1893) |
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| johnny mcilwaine Scottish footballer (1904-1980), GB (b. 1904) |
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| robert mcilwaine American lawyer, defender of racial segregation (b. 1924) |
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| ia mcilwaine professor of Library and Information Studies (b. 1935) |
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| garry mcilwaine Australian politician, AU (b. 1944) |
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| ellen mcilwaine American musician, US (b. 1945) |
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| richard mcilwaine English cricketer (born 1950), GB (b. 1950) |
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