Meaning of the surname Trejo
Trejo is a Spanish surname of the from a place type meaning "from Trejo". It is one of the 200 most common surnames in Mexico.
About this meaning. The etymology is uncertain or the popular reading is folk etymology. The page gives the best-supported explanation.
Taken from a town, region, or landscape feature in Spain, or later in Mexico: Castillo (castle), Rivera (riverbank), Navarro (from Navarre), Ibarra (Basque valley).
In Mexico a person carries two surnames, the father's and then the mother's, so Trejo appears as either half of a pair: Trejo García, López Trejo. Read how the two-surname system works.