Cognomen Maclay (Maclay 
) , in the world, is a rare family name. The family name Maclay is habitual in Australia, where it is a rare surname, the United Kingdom, and the United States. Not in comparison with a country's population, it is commonest in the United States, Philippines, and the United Kingdom. Likewise, Maclay is the forename as well as the last name.
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| Maclay | Australia, Canada, Philippines, United States, United Kingdom |
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william maclay United States Senator from Pennsylvania (1737-1804), US (b. 1737) |
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| samuel maclay American politician, US (b. 1741) |
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william b. maclay American politician (1812-1882), US (b. 1812) |
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| william maclay American politician, US (b. 1765) |
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charles maclay American politician, city founder, San Fernando Valley developer, US (b. 1822) |
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| william plunkett maclay American politician (1774-1842), US (b. 1774) |
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robert samuel maclay United States Methodist Episcopal missionary to China (1824-1907), US (b. 1824) |
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robert maclay American businessman, US (b. 1834) |
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joseph paton maclay, 1st baron maclay Scottish businessman and public servant (b. 1857) |
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| robert plunket maclay Confederate States Army Major, US (b. 1820) |
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maclay hoyne American politician and lawyer (b. 1872) |
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| arthur collins maclay (b. 1853) |
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| edgar stanton maclay American journalist, US (b. 1863) |
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| adam henry pearson maclay New Zealand (1873-7 September 1955), NZ (b. 1873) |
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| william p. maclay United States Army Medal of Honor recipient, US (b. 1877) |
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