Cognomen السيف (السيف 
) , around the world, is a common surname. The last name السيف is characteristic of Western Asia, particularly Saudi Arabia, where it is quite a common surname, Syria, where it is quite a rare surname, and Kuwait. Not in comparison with a country's population, it is the most numerous in Saudi Arabia, Sudan, and Iraq. Also, السيف is the forename as well as the last name.
| عبد الكريم بن أحمد السيف Saudi Arabian film director, SA (b. 1949) |
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| توفيق السيف Saudi Arabian writer, SA (b. 1959) |
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| أبو عمر السيف Saudi militant, SA (b. 1970) |
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| صالح السيف SA (b. 1978) |
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| رفاه السيف Saudi Arabian writer, SA (b. 1989) |
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| محمد بن عبد الله السيف SA |
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| عبد الله السيف actor, KW (b. 1991) |
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