Family name Niitsu (新津 , Niitsu ) , around the world, is a very rare last name. The cognomen Niitsu is habitual in Brazil, where it is a very rare surname, Canada, where it is an extremely rare surname, and China. Not in comparison with a country's population, this name is the most popular in China, Brazil, and the United States. Likewise, Niitsu is the forename as well as the last name.