Surname ثاني (Sani 
, Thani 
, ثاني 
) , all around the world, is a prevalent cognomen. The cognomen ثاني is habitual in Nigeria, where it is a widespread surname, Qatar, where it is a common surname, and Malaysia, where it is quite a common surname (explore the name in all countries). Not in comparison with a country's population, it is commonest in Nigeria, Indonesia, and India. Also, ثاني is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sani | Indonesia, India, Malaysia, Ethiopia, Nigeria |
| Thani | Indonesia, India, Malaysia, Qatar, Nigeria |
| ثاني | Iraq, Iran, Egypt, Sudan, Saudi Arabia |
| محمد بن ثاني آل ثاني second emir of the whole Qatari Peninsula, QA (b. 1788) |
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| جاسم بن محمد آل ثاني Founder of the modern Qatar, QA (b. 1825) |
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| عبد الله بن جاسم بن محمد آل ثاني Ruler of Qatar, QA (b. 1880) |
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علي بن سعود آل ثاني Qatar poet, QA (b. 1932) |
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سحيم بن حمد آل ثاني Member of royal family and inister of Foreign Affairs for the State of Qatar, QA (b. 1933) |
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| علي بن عبد الله آل ثاني Qatari politician, QA (b. 1892) |
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| حمد بن عبد الله آل ثاني Emir of Qatar, QA (b. 1896) |
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حمد بن خليفة آل ثاني Emir of Qatar from 1995 to 2013, QA (b. 1952) |
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حمد بن جاسم بن جبر آل ثاني Qatari politician; prime minister and foreign minister, QA (b. 1958) |
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عبد الله بن محمد بن سعود آل ثاني Qatari businessman and politician, QA (b. 1959) |
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عبد الله بن ناصر بن خليفة آل ثاني Qatari politician, QA (b. 1960) |
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حسن بن محمد بن علي آل ثاني artist, QA (b. 1960) |
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خالد بن خليفة بن عبد العزيز آل ثاني Qatari politician, QA (b. 1968) |
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| أحمد بن علي آل ثاني Emir of Qatar, QA (b. 1920) |
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علياء آل ثاني Qatari diplomat, QA (b. 1974) |
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