Here are some of the most common currency names used in the region:
* Peso: This is the most common currency name, used in countries like Argentina, Colombia, Chile, Cuba, Dominican Republic, Mexico, and Uruguay.
* Real: This is used in Brazil.
* Bolivar: This is used in Venezuela.
* Córdoba: This is used in Nicaragua.
So, while there isn't one single "most common" name, "Peso" is the most frequent currency name found in Latin America.