Cognomen Cierco (Cierco 
) , worldwide, is a rare last name. The last name Cierco is habitual in France, where it is a rare surname, Portugal, and Spain. Not in comparison with a country's population, this name is the most popular in France, Brazil, and Spain. Very seldom, Cierco is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Cierco | Brazil, France, United States, Portugal, Spain |
|
josep font i cierco Catalan chemist, ES (b. 1938) |
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virginia cierco catalan librarian, ES (b. 1977) |
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| christine cierco Ph.D. Université Paul Sabatier - Toulouse III 1996 |
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| antoni toló cierco Spanish politician, ES |
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