Looking for Herrera Sorto of El Salvador

I'm looking for any information on the surnames HERRERA SORTO. From what I'm told this side of my family is originally from anamoros, el Salvador. I do know that my grandfather, Santiago HERRERA REYES, was from the department of la union in el Salvador. He married carmen Mendoza . Santigo's mom , Maria PILAR, married Dionicio HERRERA.I'm intrested in my grandfathers paternal side only. On Santiago's paternal side they have the surnames HERRERA SORTO which are the surnames of Dionicio's father. . Our whole family is from la union el Salvador. To clear things up , santiago a my grandfather and Dionicio is my great grandfather. Santiago, my grandfather, was born 7/25/1937 and died 8/23/2001. Yucuaiquin dept. La union in el Salvador is a place of intrest. They were born or lived in close proximity to this city.