Cognomen خو (Khoo 
, Khou 
, خو 
) , around the world, is a common family name. The cognomen خو is habitual in South-eastern Asia, particularly Singapore, where it is a common surname, Malaysia, where it is quite a common surname, and Brunei (explore the name in all countries). Measured by absolute frequency, it is commonest in Malaysia, Singapore, and Australia. Also, خو is the forename as well as the last name.