Last name ローサ (Rotha 
, ローサ 
, Louçã 
) , in the world, is a rare surname. The cognomen ローサ is habitual in Cambodia, where it is a rare surname, Portugal, and Thailand, where it is a very rare surname. In absolute terms, it is the most numerous in India, Cambodia, and Thailand. Likewise, ローサ is the forename as well as the last name.