Surname Mcilwain (Mcilwain 
) , worldwide, is quite a rare cognomen. The last name Mcilwain is habitual in Papua New Guinea, where it is quite a rare surname, Australia, and New Zealand. In absolute terms, the name is most common in the United States, Australia, and Papua New Guinea.
| VARIANT | COUNTRY |
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| Mcilwain | Papua New Guinea, Canada, Australia, United States, United Kingdom |
| andrew mcilwain (b. 1750) |
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| charles howard mcilwain American constitutional historian, US (b. 1871) |
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| wally mcilwain American football player and coach (1903-1963), US (b. 1903) |
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| henry mcilwain (1912-1992) (b. 1912) |
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charlton mcilwain American academic and author (b. 1971) |
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| henry mcilwain GB (b. 1912) |
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| william mcilwain (b. 1925) |
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| stover mcilwain American baseball player, US (b. 1939) |
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| harris h. mcilwain (b. 1947) |
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| sean joseph mcilwain Ph.D. University of Wisconsin-Madison 2008 |
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| wesley r mcilwain researcher |
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| mary hope mcilwain Ph.D. Rice University 1998 |
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| jennifer mcilwain researcher (ORCID 0000-0002-7790-5081) |
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| sean j mcilwain researcher |
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| meghan e mcilwain researcher |
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