Surname קרנו (Carnot 
, קרנו 
, Karnaugh ) , around the globe, is quite a rare cognomen. The last name קרנו is habitual in France, where it is quite a rare surname, Switzerland, where it is a rare surname, and Chile. Measured by absolute frequency, it is commonest in France, the United States, and Brazil. Likewise, קרנו is the forename as well as the last name.