Willis

"There were only a handful of nonhumans in White Orchard. One of them was the dwarf Willis, an excellent blacksmith whose wares attracted peasants from far and wide. Sadly, his forge had burned to the ground shortly before Geralt arrived. Willis suspected the fire had been started deliberately and asked the witcher to investigate this alleged arson."

Is Blacksmith in White Orchard and gaver of quest called Twisted Firestarter.