Cognomen 卡鲁斯 (Carruth 
, 卡鲁斯 
) , globally, is quite a rare last name. The last name 卡鲁斯 is characteristic of the United States, where it is quite a rare surname, Ireland, where it is a rare surname, and New Zealand. Not in comparison with a country's population, it is commonest in the United States, the United Kingdom, and Australia.