Last name Sigra (Sigra 
, Seire 
, Sejre 
) , around the world, is a rare family name. The cognomen Sigra is characteristic of Northern Europe, particularly Estonia, where it is quite a rare surname, Sweden, where it is a rare surname, and Lithuania. In absolute terms, this name is the most popular in Indonesia, Estonia, and Sweden. Likewise, Sigra is the forename as well as the last name.