Cognomen Ronan (Ronan 
, 罗南 
, رونان 
, along with others...) , in all the world, is quite a common surname. The cognomen Ronan is characteristic of Ireland, where it is quite a common surname, Isle of Man, and Australia, where it is quite a rare surname. Measured by absolute frequency, this name is the most popular in the United States, Ireland, and the United Kingdom. More frequently, Ronan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ronan | Ireland, France, Philippines, Brazil, United States |
| 罗南 | China |
| رونان | Iraq, Palestinian Territory |
| Ронан | Ukraine, Russia, Kazakhstan |
| רונאן | Israel |
| george ronan American soldier, US (b. 1783) |
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| stephen ronan (1848–1925) Irish barrister and judge, GB (b. 1848) |
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| peter ronan (b. 1839) |
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daniel j. ronan American politician, US (b. 1914) |
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| john ronan Canadian composer and choir director, CA (b. 1894) |
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mark ronan American mathematician, US (b. 1947) |
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| mary ronan Australian Sister of Mercy, AU (b. 1904) |
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| peter ronan association football player, GB (b. 1911) |
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| william ronan American public servant and academic, US (b. 1912) |
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| charles e. ronan military officer and professor of military science (b. 1914) |
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| thomas p. ronan US (b. 1908) |
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| colin ronan British author on history and philosophy of science (1920–1995), GB (b. 1920) |
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| gerard ronan Canadian field hockey player, CA (b. 1932) |
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| walter ronan FR (b. 1923) |
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| james a. ronan (b. 1931) |
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Melo, Borges, Junior, Vieira, Martins, Marques, Moreira, Miranda, Almeida, Andrade, Cardoso, Barbosa, Pereira, Ribeiro, Freitas, Fonseca, Carvalho, Teixeira, Ferreira, Oliveira, Rodrigues, Goncalves, Campos, Castro, Araujo, Soares, Cruz, Reis, Dias, Lima, Silva, Sousa, Souza, Smith, Alves, Costa, Fernandes, Byrne, Paula, Ramos, Rocha, Gomes, Lopes, Jesus, Faria, Filho, Murphy, Santos, Kelly, and Nascimento