Surname 夏居 (Natsui 
, 夏居) , in all the world, is a very rare last name. The family name 夏居 is habitual in Brazil, where it is an extremely rare surname, Nigeria, and the United States. Not in comparison with a country's population, the name is most common in Brazil, China, and the United States. Much more prevalently, 夏居 is the forename as well as the last name.