Cognomen Байар (Bayar 
, Bajar 
, Baiar 
) , globally, is a common last name. The last name Байар is characteristic of Mongolia, where it is quite a common surname, Turkey, and Tunisia, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in Turkey, Philippines, and India. Very seldom, Байар is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Bayar | Turkey, Philippines, India, Iraq, Mongolia |
| Bajar | Turkey, Tunisia, Philippines, India, Pakistan |
| Baiar | Georgia, United States, India, France, Brazil |
| Байар | Kyrgyzstan, Russia, Ukraine, Belarus |
| байар i RU |
|