Family name كايني (Keane 
, كايني) , in the world, is a common cognomen. The surname كايني is habitual in Ireland, where it is a common surname, Cayman Islands, where it is quite a common surname, and Australia. In absolute terms, it is commonest in the United States, Ireland, and the United Kingdom. Much less frequently, كايني is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Keane | Australia, Ireland, Indonesia, United States, United Kingdom |