Family name Mountjoy (Mountjoy 
) , around the world, is quite a rare cognomen. The cognomen Mountjoy is habitual in Ireland, where it is a rare surname, Australia, and the United Kingdom. In absolute terms, the name is most common in the United States, the United Kingdom, and South Africa.
| VARIANT | COUNTRY |
|---|---|
| Mountjoy | United Kingdom, Australia, United States, South Africa, Canada |
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don mountjoy Australian politician (1906-1988), AU (b. 1906) |
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| bill mountjoy American baseball player, CA (b. 1858) |
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dick mountjoy American politician, US (b. 1932) |
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| rosalind harriett emily mountjoy (1890-1972) (b. 1890) |
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| roberta jean mountjoy (b. 1913) |
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| eric w. mountjoy Canadian geologist, CA (b. 1931) |
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| doug mountjoy Welsh snooker player (1942-2021), GB (b. 1942) |
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| max mountjoy (b. 1933) |
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| edward mountjoy researcher ORCID ID = 0000-0002-0626-1821 |
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| gavin mountjoy researcher |
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| margaret eleanor mountjoy Peerage person ID=689293 |
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| isolda mountjoy Peerage person ID=165267 |
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| margo mountjoy researcher |
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| lesley james mountjoy Peerage person ID=689294 |
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| robert harbison mountjoy Ph.D. The University of Chicago 1964 |
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