Family name ล่าง (Lang 
, ล่าง) , across the world, is a widespread cognomen. The cognomen ล่าง is habitual in Marshall Islands, where it is a common surname, Austria, and Germany (explore the name in all countries). Measured by absolute frequency, it is the most numerous in China, Germany, and the United States. Very seldom, ล่าง is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Lang | Austria, Germany, United States, Malaysia, China |