Cognomen אייר (Air 
, Ayer 
, Ajer 
) , around the globe, is a common surname. The cognomen אייר is habitual in Nepal, where it is quite a common surname, Switzerland, and Norway, where it is quite a rare surname. Measured by absolute frequency, the name is most common in Nepal, India, and the United States. Likewise, אייר is the forename as well as the last name.