All over the world, Рейнис (Reinis 
, Reynis 
, Рейнис 
) is a rare masculine first name. The first name Рейнис is characteristic of Latvia, where it is quite a common boy's name, Cuba, where it is a rare boy's name, and the United Kingdom, where it is a very rare mostly boy's, but seldom feminine name. Measured by absolute frequency, it is commonest in Latvia, Cuba, and Russia. Much less frequently, Рейнис is the last name as well as the forename.