Surname 朗茨 (Runtz 
, 朗茨) , in the world, is a rare cognomen. The cognomen 朗茨 is characteristic of France, where it is a rare surname, Canada, and New Zealand, where it is a very rare surname. Not in comparison with a country's population, the name is most common in France, the United States, and Canada. Much less frequently, 朗茨 is the forename as well as the last name.