Worldwide, Sibert (Siebert 
, Sibert , Сиберт 
) is a rare masculine first name. The forename Sibert is characteristic of South Africa, where it is a rare male name, Belgium, and Germany, where it is a very rare primarily male, but very seldom feminine name. Measured by absolute frequency, it is the most numerous in South Africa, Germany, and the United States. Much more frequently, Sibert is the last name as well as the forename.