Surname Mortimer (Mortimer 
, モーティマー, מורטימר 
) , worldwide, is a common cognomen. The family name Mortimer is habitual in Bahamas, where it is quite a common surname, Isle of Man, and Reunion (explore the name in all countries). In absolute terms, it is the most numerous in the United Kingdom, the United States, and Australia. Much less frequently, Mortimer is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Mortimer | Australia, South Africa, Canada, United Kingdom, United States |
| מורטימר | Israel |
| Мортимер | Russia |
France, Mórtimer, and มอร์ทิเมอร์
| ranulph de mortimer Anglo-Norman Marcher lord (b. 1001) |
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| hugh de mortimer Norman-English baron, died c.1181 (b. 1117) |
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| hugh de mortimer English nobleman, died 1227 (b. 1150) |
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| roger de mortimer (b. 1150) |
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| margaret mortimer, baroness mortimer Wife of Edmund Mortimer of Wigmore, 2nd Baron Mortimer (b. 1201) |
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roger mortimer English Marcher lord, GB (b. 1256) |
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| roger mortimer English Baron (1231–1282), GB (b. 1231) |
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| isabel mortimer English countess, GB (b. 1247) |
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| edmund mortimer, 2nd baron mortimer 2nd Baron Mortimer (b. 1251) |
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| ralph mortimer (b. 1250) |
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katherine mortimer, countess of warwick English countess, GB (b. 1314) |
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roger mortimer English nobleman and military commander during the Hundred Years' War (1328-1360), GB (b. 1328) |
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| roger mortimer English nobleman and rebel (1287-1330), GB (b. 1287) |
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| joan de mortimer Peerage person ID=531129 (b. 1291) |
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| margaret de mortimer Peerage person ID=328375 (b. 1295) |
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