Etymology
Inherited from Middle English scalle, assumed to stem from Old Norse skalli (“bald heard, skull”), from Proto-Germanic *skallô; compare Finnish kallo (“skull”).
However, the later form scald, coincides with Old Norse *skolð, Old Swedish skoldh, skold, skol, Swedish skål, skoll, skolla, Danish skold, skolde, Norwegian skåld (“scurf, rash”).