Surname Кэйр (Cahir 
, Кэйр 
) , globally, is a rare last name. The cognomen Кэйр is characteristic of Ireland, where it is quite a rare surname, Australia, where it is a rare surname, and the United Kingdom, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Australia, the United States, and Ireland. Also, Кэйр is the forename as well as the last name.