Last name 鲁兰 (Ruland 
, 鲁兰 
) , throughout the world, is quite a rare cognomen. The surname 鲁兰 is habitual in Germany, where it is quite a rare surname, Belgium, where it is a rare surname, and Bahrain. Measured by absolute frequency, it is commonest in Germany, the United States, and Indonesia. Much less frequently, 鲁兰 is the forename as well as the last name.