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 | Philippines, Mongolia, India, Iraq, Turkey |
| Bajar | Philippines, India, Tunisia, Pakistan, Turkey |
| Baiar | Brazil, France, India, Georgia, United States |
| Байар | Russia, Ukraine, Kyrgyzstan, Belarus |
| байар i RU |
|