I am at my parents' house, and like you I started looking up Khoslas on google for fun and found you all. I think we can help you a bit with your inquiries about where the family started.
There are three branches of the Khosla family, they originate from three towns: Noormahal, Talvan, and Rahoon. Inder's family originated in Noormahal. It is said that there were three brothers who were Robin Hood type characters (thieves). The three brothers were separated into these three towns because apparently they would only steal when they were together. Their name was Khosla, and it is believed that all Khoslas return to these three original brothers.
Before Partition, our branch of the family lived in Lahore. Inder's grandfather was Diwan Bahdur Diwan Krishan Kishore. We moved from Lahore to New Delhi in 1947. Part of the family is in India, another part is in Britain, and we are in the U.S.A. now.