As Venom said, the vast majority of scorpions do not have common names.
Pandinus imperator and P. cavimanus are the only Pandinus spp. that have common names.
If all else fails, you can make up a common name based on the species name, for example, you could call P. smithi "Smith's scorpion." Similarly, Uroctonus mordax is sometimes called the "mordant scorpion."