Surname Lainier (Lanier 
, Lainier 
) , across the world, is a common last name. The surname Lainier is habitual in the United States, where it is quite a rare surname, France, and Nicaragua. Not in comparison with a country's population, this name is the most popular in the United States, France, and Canada. Very seldom, Lainier is the forename as well as the last name.