Cognomen 桂兰 (桂兰 
, Guilan 
, 계란 
) , in the world, is a common family name. The last name 桂兰 is characteristic of China, where it is quite a rare surname, Philippines, where it is a rare surname, and Romania. Measured by absolute frequency, the name is most common in China, Philippines, and Malaysia. More frequently, 桂兰 is the forename as well as the last name.