All around the world, ثامر (ثامر 
, Thamer 
, Thamir 
) is a common masculine given name. The first name ثامر is characteristic of Iraq, where it is quite a common masculine name, Saudi Arabia, and Tunisia (explore the name in all countries). Very seldom, ثامر is the last name as well as the forename.
| VARIANT | COUNTRY |
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| ثامر | Jordan, Syria, Saudi Arabia, Iraq, Yemen |
| Thamer | Kuwait, Saudi Arabia, Iraq, Algeria, Tunisia |
| Thamir | Saudi Arabia, Algeria, Iraq, United Arab Emirates, Tunisia |
| Thamr | Saudi Arabia, Iraq, Syria, Malaysia |
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الحبيب ثامر Tunisian politician and physician, TN (b. 1909) |
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ثامر الغضبان Iraqi politician, IQ (b. 1945) |
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| ثامر بن سعود بن عبد العزيز آل سعود Saudi Arabian military personnel, SA (b. 1927) |
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| ثامر رزوقي الشيخلي former Iraqi minister, IQ (b. 1936) |
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| ثامر بن عبد العزيز آل سعود Saudi royal, SA (b. 1937) |
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| ثامر محسن Iraqi football manager (1938-1995), IQ (b. 1938) |
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| ثامر الميمان Saudi Arabian journalist, SA (b. 1951) |
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| ثامر يوسف Iraqi footballer, IQ (b. 1953) |
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| ثامر عناد association football player, KW (b. 1970) |
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| ثامر السبهان SA (b. 1967) |
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| ثامر علي الصباح Kuwaiti politician, KW |
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| ثامر محمد association football player, AE (b. 1984) |
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| ثامر السويط KW (b. 1976) |
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| ثامر كمال علي athletics competitor, QA (b. 1988) |
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| ثامر الشعيبي actor, KW (b. 1989) |
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علي, الساعدي, الشراري, الدليمي, الجبوري, الجنابي, الجميلي, الربيعي, الرويلي, الخالدي, الخفاجي, التميمي, الغامدي, المالكي, المطيري, الموسوي, عبدالله, الحسناوي, الحمداني, البصراوي, الزهراني, القحطاني, الحارثي, الفتلاوي, العتيبي, العبيدي, احمد, حسين, صالح, محمد, العلي, الثامر, العطوي, العنزي, الحربي, الحنين, البلوي, الشمري, الشهري, الجهني, الطائي, الملكي, القيسي, الكعبي, الدوسري, العامري, العراقي, العزاوي, and الكربلائي