Wold, is derived from the Old EnglishWald meaning forest. Over the years the meaning has changed from forest to open high ground. The suggested reason for this change of meaning, is that originally Wold would have applied to high forest land and that when the forest had been cleared the name survived, particularly in the Cotswolds and the Lincolnshire and Yorkshire Wolds.
Westward before her rose fold upon fold of the encircling hills, piled rich and golden.
Description of the Yorkshire Wolds by Winifred Holtby.