Throughout the world, Mércia (Mercia 
, Mércia 
) is a widespread principally girly, but very infrequently masculine first name. The first name Mércia is habitual in the Democratic Republic of the Congo, where it is a common mostly girly, but uncommonly boy's name, Namibia, where it is quite a common female name, and Brazil. Measured by absolute frequency, this name is the most popular in the Democratic Republic of the Congo, Brazil, and South Africa.
| VARIANT | COUNTRY |
|---|---|
| Mercia | Democratic Republic of the Congo, Philippines, South Africa, Mozambique, Brazil |
| Mércia | South Africa, Mozambique, Brazil, United States, Portugal |
| mércia ferreira da silva person identified in the Museu da Pessoa collection, BR (b. 1955) |
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| mércia viriato licá Mozambican lawyer and politician (b. 1958) |
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| mércia pandolfo provin researcher (ORCID 0000-0001-7529-585X) |
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| mércia gomes oliveira de carvalho researcher (ORCID 0000-0002-0612-9396) |
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| mércia santos cruz researcher (ORCID 0000-0002-5823-725X) |
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| tota da mércia |
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| mércia nakashima BR (b. 1981) |
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Melo, Martins, Machado, Santana, Almeida, Andrade, Araújo, Cardoso, Barreto, Barbosa, Bezerra, Pereira, Ribeiro, Tavares, França, Silveira, Carvalho, Cristina, Ferreira, Oliveira, Rodrigues, Fernandes, Vieira, Regina, Borges, Barros, Cruz, Dias, Lima, Maria, Moura, Silva, Sousa, Souza, Alves, Costa, Gonçalves, Brito, Rocha, Gomes, Lopes, Nunes, Viana, Moraes, Mendes, Santos, Soares, Castro, Ramos, and Nascimento