Surname Iacomus (James 
, Jaime , Jaume 
) , throughout the world, is a prevalent last name. The surname Iacomus is habitual in Latin America and the Caribbean, particularly Saint Lucia, where it is a widespread surname, Saint Vincent and the Grenadines, and Antigua and Barbuda (explore the name in all countries). Measured by absolute frequency, this name is the most popular in Nigeria, Mexico, and the United States. More prevalently, Iacomus is the forename as well as the last name.