Throughout the world, Sinei (Sinei 
) is a rare primarily girly, but scarcely male given name. The first name Sinei is habitual in Brazil, where it is a rare female name, Tanzania, where it is a very rare girly name, and Indonesia. Measured by absolute frequency, this name is the most popular in Brazil, India, and Indonesia. Also, Sinei is the last name as well as the forename.