Across the world, Rainiero (Rainiero 
, Ренье 
) is a rare masculine given name. The first name Rainiero is habitual in the Dominican Republic, where it is a rare male name, Italy, and Peru, where it is a very rare boy's name. Not in comparison with a country's population, this name is the most popular in Italy, Mexico, and the Dominican Republic. Also, Rainiero is the last name as well as the forename.