Cognomen אמברוסיוס (Ambrosius 
, אמברוסיוס 
) , in all the world, is quite a rare last name. The surname אמברוסיוס is habitual in Namibia, where it is quite a rare surname, Denmark, and Germany. Measured by absolute frequency, the name is most common in Germany, the United States, and Indonesia. Also, אמברוסיוס is the forename as well as the last name.