Cognomen Mcilrath (Mcilrath 
) , worldwide, is quite a rare family name. The surname Mcilrath is characteristic of the United States, where it is a rare surname, the United Kingdom, and Australia.
| VARIANT | COUNTRY |
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| Mcilrath | Australia, South Africa, Canada, United Kingdom, United States |
| chas. mcilrath (b. 1829) |
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| william mcilrath (1876-1955) merchant and philanthropist (b. 1876) |
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| patricia mcilrath American theatre director, US (b. 1917) |
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tim mcilrath American musician, US (b. 1978) |
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| donald christner mcilrath (b. 1929) |
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dylan mcilrath Canadian ice hockey player, CA (b. 1992) |
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| lesley mcilrath Australian former snooker player |
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| joanne mcilrath researcher |
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