Cognomen Sebastiá (Sebastiá 
, Себастиа 
) , in the world, is a very rare family name. The cognomen Sebastiá is characteristic of Spain, where it is a rare surname, Argentina, where it is an extremely rare surname, and Mexico. Much less frequently, Sebastiá is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Sebastiá | Mexico, Argentina, Spain |
| Себастиа | Armenia |
| enrique bayón sebastiá ES (b. 1890) |
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| rafael couchoud sebastiá ES (b. 1914) |
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| josé maría doñate sebastiá ES (b. 1921) |
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| agustín sebastiá Spanish cyclist, ES (b. 1964) |
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| sebastiá martín molleví Ph.D. Universitat Politècnica de Catalunya 1998 |
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| sebastiá gascó Spanish painter |
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| isabel ana sebastiá ES |
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Mª, Blanca, Rafael, Javier, Judith, Esther, Hector, Victor, Alberto, Andrés, Antonio, Arantxa, Adrián, Rosario, Rodrigo, Ricardo, Joaquin, Enrique, Héctor, Vicente, Ignacio, Mariamor, César, Carmen, Carlos, Amparo, Ana, Mari, Luis, Jose, Juan, Maria, Marta, Carla, Pablo, Pedro, Salvador, David, Johan, Jorge, Nacho, Elena, María, Manuel, Mireia, Miquel, Silvia, Sergio, José, and Consuelo