Cognomen Rex (Rex 
, ريكس 
, 雷克斯 , among others...) , throughout the world, is a common family name. The last name Rex is habitual in Greenland, where it is quite a common surname, Sudan, and Papua New Guinea, where it is quite a rare surname. Measured by absolute frequency, this name is the most popular in Sudan, the United States, and Nigeria. More prevalently, Rex is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Rex | Philippines, United States, Papua New Guinea, Nigeria, China |
| ريكس | Sudan, Saudi Arabia |
| 雷克斯 | China |
| Рекс | Kazakhstan, Russia, Ukraine, Belarus |
| רקס | Israel |
| henricus rex author of Epistola ad Henricum III Angliae regem (b. 1235) |
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carl rex DE (b. 1660) |
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carl august von rex DE (b. 1701) |
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| johann-kaspar von rex 12 May 1689 - 23 May 1737 Uckro (b. 1689) |
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| caroline dorothea elisabeth von rex 19 Oct 1718 Uckro - 19 Feb 1791 Altenburg (b. 1718) |
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| friedrich wilhelm von rex DE (b. 1710) |
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| sophie friederike karoline rex (b. 1715) |
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| friedrich august rex (b. 1721) |
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| johann caspar gottlob von rex DE (b. 1730) |
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| george rex British businessman, GB (b. 1765) |
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george rex Ohio Jurist and legislator, US (b. 1817) |
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| johann karl friedrich rex 1780-1866 (b. 1780) |
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| johanna mariana von rex (b. 1771) |
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| karl august wilhelm von rex DE (b. 1774) |
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karl von rex DE (b. 1825) |
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Lee, Parker, Rogers, Garcia, Taylor, Thomas, Nelson, Harris, Walker, Wilson, Wright, Bennett, Roberts, Russell, Jackson, Johnson, Anderson, Robinson, Thompson, Harrison, Williams, Dela Cruz, Miller, Morgan, Martin, Young, Chan, Chen, Bell, King, Reed, Hall, Wang, Wong, Moore, Smith, Richardson, Allen, Clark, Baker, Brown, Ramos, Reyes, Davis, Lewis, Jones, Evans, White, Adams, and Villanueva