Cognomen 兰齐 (Ranzy 
, 兰齐 
, Lantzy 
) , all around the world, is a rare surname. The family name 兰齐 is habitual in the United States, where it is a rare surname, Belgium, where it is a very rare surname, and Egypt. In absolute terms, it is the most numerous in the United States, Egypt, and China. Much less frequently, 兰齐 is the forename as well as the last name.