Barrera is a Spanish, Portuguese and Italian surname, meaning "barrier". The name has many variant spellings of the name which include: Barrios, de Barrios, Barrio, de Barrio, Barro, Barros, de Barros, Barroso, Barrera, de Barrera, de la Barrera, de Barreda, Barral, Barreto, Barrientos, Bareis, Barela, Barreras, Barrere, Barresi, Barreto, Barretta, Barrios, Barris, Barros, Barrientos and Barroso and many more, were first found in the Kingdom of Castile, a Christian kingdom of medieval Spain. History.
https://en.wikipedia.org/wiki/Barrera