Last name origin

Hi y'all! I'm trying to find the towns of my dad's side pre partition (they moved to southeast Asia before partition). I get mixed results on Sandhanwalia and Mohar. The only thing I could find on Mohar was on jatland wiki which gave me Uttar Pradesh but I know my family's never been near that side. As for Sandhanwalia, it says the last name from a Turkic tribe, Karakalpaks (?) but this was written by a British guy so I'm skeptical. If anyone could find it or know it through oral history, that's be great!