William Helm

(male) Probably the most successful of all the Old French names of Germanic origin that were introduced to England by the Normans. It is derived from Germanic wil ‘will, desire’ + helm ‘helmet, protection’. The fact that it was borne by the Conqueror himself does not seem to have inhibited its favour with the ‘conquered’ population: in the first century after the Conquest it was the commonest male name of all, and not only among the Normans. In the later Middle Ages it was overtaken by John, but continued to run second to that name until the 20th century, when the picture became more fragmented.

English (chiefly Lancashire): topographic name for someone who lived by or worked at a rough temporary shelter for animals, Middle English helm (Old Norse hjalmr, related to the Old English and Old High German words in 2 below), or a habitational name from a minor place named Helm or Helme from this word, as for example in County Durham, Northumberland, and West Yorkshire.