
1. Indo-Iranian
The Indo-Iranian language family is comprised of languages spoken primarily in Iran, Afghanistan, some former Soviet republics, some areas of Iraq and Turkey, Pakistan, India and Bangladesh. It includes two sub-branches: Indo-Aryan (Indic) and Iranian. Source
Indo-Iranian languages were spoken by nearly one billion individuals, most of whom resided in a broad region of southwestern and southern Asia.
Speakers of modern Iranian languages number between 150 and 200 million; Speakers of modern Indo-Aryan languages number more than 800 million persons.