Last name Mcgrann (Mcgrann 
) , in the world, is a rare cognomen. The surname Mcgrann is habitual in Ireland, where it is a rare surname, the United Kingdom, and the United States.
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| Mcgrann | Canada, Australia, United States, United Kingdom, Ireland |
| frank mcgrann band conductor and civil servant, US (b. 1880) |
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| jeremiah walker mcgrann (b. 1952) |
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| tom mcgrann college basketball player (1961–1963) Minnesota |
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| molly mcgrann Novelist and London Editor of A Public Space, US |
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| james michael mcgrann Ph.D. Texas A&M University 1973 |
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