Cognomen Cato (Cato 
, كاتو 
, カトー 
) , in the world, is a common family name. The cognomen Cato is characteristic of Saint Vincent and the Grenadines, where it is a common surname, Grenada, and New Zealand, where it is quite a common surname (explore the name in all countries). Not in comparison with a country's population, it is commonest in the United States, New Zealand, and Ghana. Much less frequently, Cato is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Cato | Philippines, United Kingdom, Ghana, United States, New Zealand |
| كاتو | Iraq, Egypt, Jordan, Sudan |
| カトー | Japan |
| Катон | Russia, Kazakhstan |
| marcus porcius cato Roman consul in 36 AD (b. 50) |
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| publius valerius cato 1st-century BC Roman poet and grammarian (b. 50) |
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| marcus porcius cato son of Cato the Younger, GR (b. 73) |
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lucius porcius cato Roman consul in 89 BC (b. 200) |
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| marcus porcius cato praetor 92 BC (b. 150) |
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| cato salonianus son of Cato the Elder, magistrate (b. 154) |
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| c. porcius m.f.m.n. cato Roman consul in 114 BC (b. 157) |
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marcus porcius cato Roman politician, soldier and writer (234–149 BC), IT (b. 234) |
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| m. porcius m.f.m.n. cato Roman consul in 118 BC (b. 200) |
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| marcus porcius cato ancient Rome politician (b. 200) |
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dionysius cato author of distichs of Cato (b. 300) |
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| l.hostilius cato legate 190 BC (b. 300) |
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| c.hostilius cato praetor 207 BC (b. 300) |
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| a.hostilius cato praetor 207 BC (b. 300) |
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| renato cato IT (b. 1519) |
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