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 |
|---|---|
| Mcilwain | Australia, Canada, United States, United Kingdom, Papua New Guinea |
| andrew mcilwain (b. 1750) |
|
|
| charles howard mcilwain American constitutional historian, US (b. 1871) |
|
|
| wally mcilwain American football player and coach (1903-1963), US (b. 1903) |
|
|
| henry mcilwain (1912-1992) (b. 1912) |
|
|
|
charlton mcilwain American academic and author (b. 1971) |
|
| henry mcilwain GB (b. 1912) |
|
|
| william mcilwain (b. 1925) |
|
|
| stover mcilwain American baseball player, US (b. 1939) |
|
|
| harris h. mcilwain (b. 1947) |
|
|
| sean joseph mcilwain Ph.D. University of Wisconsin-Madison 2008 |
|
|
| wesley r mcilwain researcher |
|
|
| mary hope mcilwain Ph.D. Rice University 1998 |
|
|
| jennifer mcilwain researcher (ORCID 0000-0002-7790-5081) |
|
|
| sean j mcilwain researcher |
|
|
| meghan e mcilwain researcher |
|