William Porter

(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 and Scottish: occupational name for the gatekeeper of a walled town or city, or the doorkeeper of a great house, castle, or monastery, from Middle English porter ‘doorkeeper’, ‘gatekeeper’ (Old French portier). The office often came with accommodation, lands, and other privileges for the bearer, and in some cases was hereditary, especially in the case of a royal castle. As an American surname, this has absorbed cognates and equivalents in other European languages, for example German Pförtner (see Fortner) and North German Poertner.