Worldwide, Gustr (Gust 
, Gustr, Gustur 
) is quite a rare mostly boy's, but uncommonly girly forename. The forename Gustr is characteristic of Luxembourg, where it is quite a rare male name, Belgium, and Mongolia. Not in comparison with a country's population, it most frequently occurs in Egypt, the United States, and Belgium. Likewise, Gustr is the last name as well as the forename.