Surname Sieni (Sieni 
) , in the world, is a rare family name. The last name Sieni is characteristic of Cameroon, where it is a rare surname, Italy, and South Africa, where it is a very rare surname. Also, Sieni is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Sieni | Tanzania, South Africa, Italy, Cameroon, Indonesia |
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katepu sieni Tuvuluan footballer, TV (b. 1988) |
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| virgilio sieni italian choreographer and dancer, IT (b. 1958) |
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| elena sieni researcher |
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| elisabetta sieni researcher |
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