Last name Sinclair (Sinclair 
, סינקלייר 
, Синклер 
) , all around the world, is a common surname. The family name Sinclair is habitual in Jamaica, where it is a common surname, Isle of Man, where it is quite a common surname, and New Zealand (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in the United States, the United Kingdom, and Australia. Much less frequently, Sinclair is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sinclair | Australia, Canada, Jamaica, United Kingdom, United States |
| סינקלייר | Israel |
| Синклер | Russia |
| Сінклер | Ukraine |
St. Claire, Синцлаир, and ซินแคลร์
| william sinclair Bishop of Dunkeld (b. 1201) |
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| henry sinclair Scottish soldier (died c.1330) (b. 1250) |
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| william sinclair Scottish baron (died 1299x1303) (b. 1250) |
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| william sinclair of roslin Scottish nobleman (b. 1250) |
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henry i sinclair, earl of orkney Scottish and Norwegian nobleman, GB (b. 1345) |
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| william sinclair Scottish nobleman, died 1330 (b. 1300) |
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| robert sinclair Bishop of Orkney and bishop of Dunkeld (b. 1301) |
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| elizabeth sinclair Peerage person ID=142247 (b. 1363) |
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| henry ii sinclair Earl of Orkney (b. 1375) |
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| william sinclair Scottish nobleman, last Jarl of Orkney; Lord Chancellor of Scotland, GB (b. 1410) |
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| william sinclair Scottish Earl (b. 1459) |
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| robert sinclair (1480-1507) (b. 1480) |
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| elizabeth sinclair (1505-1580) (b. 1505) |
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| henry sinclair Scottish lord-president of the court of session and bishop of Ross, GB (b. 1508) |
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| andrew sinclair Scottish nobleman in Denmark, GB (b. 1555) |
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