Wow so many dumb and totally unrelated comments by some people. And what's wrong with having hindu or buddhist ancestors? Abu Bakr, Ali, etc etc were all converts from a jaahilia religion.. South Asians really need to read and embrace history instead of romanticizing it and talking !@#$ all the time.
Back to the topic, I believe Yousafzai are also mentioned by Alexander's men, and were called "Aspasioi". The name "Aspa" is thought to have meant "horse riders" as sanskrit for horses is aspa, pronounced "asap" if I'm not mistaken. Alexander had a fight with those Aspasioi as well. And yes it's well possible that these people might be pashtunized.