Cognomen Mcduffy (Mcduffy 
) , across the world, is a rare surname. The cognomen Mcduffy is habitual in the United States, where it is a rare surname, Canada, where it is a very rare surname, and Australia. Much less frequently, Mcduffy is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Mcduffy | Australia, Canada, Philippines, United States, United Kingdom |
| martell mcduffy college basketball player (2006–2009) Radford |
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| mike mcduffy |
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