Which branch of the Indo-European language family has most speakers?

The branch of the Indo-European language family with the most speakers is Indo-Aryan.

Here's why:

* Vast Number of Speakers: Indo-Aryan languages, including Hindi, Urdu, Bengali, Marathi, Punjabi, Gujarati, and many others, are spoken by over 1.5 billion people worldwide.

* Geographical Distribution: They are primarily spoken in India, Pakistan, Bangladesh, Nepal, Sri Lanka, and other regions of South Asia.

While other branches like Germanic, Romance, and Slavic have significant numbers of speakers, Indo-Aryan languages dominate in terms of sheer volume due to the immense population of India and its surrounding regions.