Cognomen 洛因 (Lowin 
, 洛因 
, Lowein ) , in the world, is a rare family name. The cognomen 洛因 is habitual in Germany, where it is a rare surname, the United Kingdom, and Myanmar. Measured by absolute frequency, the name is most common in Germany, the United Kingdom, and the United States. Also, 洛因 is the forename as well as the last name.