Last name Sineiro (Sineiro 
) , globally, is a rare surname. The cognomen Sineiro is characteristic of Uruguay, where it is a rare surname, Spain, and Argentina. Not in comparison with a country's population, it is the most numerous in Spain, Argentina, and the United States.
| VARIANT | COUNTRY |
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| Sineiro | Uruguay, Spain, Argentina, France, United States |
| josé manuel ramírez sineiro (b. 1703) |
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| francisco sineiro Spanish politician, ES (b. 1949) |
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| sofía sprechmann sineiro Secretary General of CARE International, UY (b. 1969) |
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| denilson hernanes santos sineiro football player, BR (b. 1987) |
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| rita sineiro portuguese writer, PT (b. 1988) |
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Mr, Maria, Mario, Marta, Marco, Marã, Magda, Mauro, Mabel, Mirta, Sonia, Sofia, Alice, Andre, Anita, Celso, Cindy, Cirso, Berta, Paula, Paulo, Pablo, Olga, Hebe, Erea, Edel, Ms, Ana, Rui, Ney, Eva, Sani, Sara, Clã, Paul, Raul, Pedro, Rosa, Rita, Luis, Luiz, Jose, John, Joao, Joel, Joã, Juan, Nuno, Rena, and Ramon