Yadu was the eldest son of Yayati (father of Yadavs). It is written in the Vishnu Puran that he did not inherit his father's throne. He, therefore, retired towards Punjab and Iran. He had five sons, of whom except Satjit and Krishna, three remained childless. Satjit had three sons Bibai (Biveya), Hai (Heya) whose descendants are Jats of 'Heer' gotra and Ahai (Aheya) who founded the Ahir community.[16]
most Ahirs write "Yadav", but not all Yadavs are Ahirs. Make sense? Only Yaduvanshi's of Haryana, Rajasthan, Gujrat,Pakistan, Upper doab ,and bundelkhand are yaduvanshi's and "YADAVS".
Yadu Vanshi Ahirs have common gotras with the Jats (eg, Dahiya, Dagar, Balwan, Rathi, Thakran, Dhaliwal , Lamba, Mahlawat,Nirban, Dalal, Solanki, Tomar, Nikumbh, Atri etc)
The Book by Ram Swarup Joon
1938, 1967 (Eng Tr)
* 2 Ahirs (Abhiras) And Jats
* 3 Ahir Gotras
* 4 Ahir Raj in Rewari...
Ahirs in North Western parts of India have similar customs to the JATS. Widow marriage is practiced by them.
etc etc...
I hope our jat historians would get something out for the research done by Sir Henry.