The López surname is very common in Spain (it is among the five most frequent), and in Latin American countries. In fact, surely if you stop to think, you know more than one person who has it in their name as their first or second surname. There are several theories that circulate about the origin of this surname, however, one of them is given more truth than the others: it is the theory that explains that the surname López began to be used in ancient Rome during the stage of the Roman domination.