Family name Lotu (Lotu 
, Rotu 
) , across the world, is quite a rare last name. The cognomen Lotu is characteristic of Papua New Guinea, where it is quite a rare surname, Ethiopia, where it is a rare surname, and New Zealand. Measured by absolute frequency, this name is the most popular in India, Indonesia, and Ethiopia. Likewise, Lotu is the forename as well as the last name.