Cognomen היידר (Haider 
, Hader 
, היידר 
) , across the world, is a widespread surname. The family name היידר is habitual in Pakistan, where it is a common surname, United Arab Emirates, and Bahrain (explore the name in all countries). Measured by absolute frequency, it is commonest in Pakistan, Bangladesh, and Iraq. Likewise, היידר is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Haider | Bangladesh, India, Pakistan, Iraq, Saudi Arabia |
| Hader | Egypt, India, Pakistan, Iraq, Saudi Arabia |
| היידר | Israel |