William Cooper

(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: occupational name for a maker and repairer of wooden vessels such as barrels, tubs, buckets, casks, and vats, from Middle English couper, cowper (apparently from Middle Dutch kūper, a derivative of kūp ‘tub’, ‘container’, which was borrowed independently into English as coop). The prevalence of the surname, its cognates, and equivalents bears witness to the fact that this was one of the chief specialist trades in the Middle Ages throughout Europe. In America, the English name has absorbed some cases of like-sounding cognates and words with similar meaning in other European languages, for example Dutch Kuiper.