From a medieval variant of William + the patronymic suffix -s.
Willems Sentence Examples
In pursuit of his art he travelled, and is said to have reached England; ill-health drove him homewards in 1524, in which year he married Dirckgen Willems at Delft.
Pardon, De Aerariis (Berlin, 1853); P. Willems, Le Droit public romain (1883); A.
Among Flemish serials may be mentioned the Nederduitsche Letteroefeningen (1834); the Belgisch Museum (1836-1846), edited by Willems; the Broederhand, which did not appear after 1846; the Taalverbund of Antwerp; the Kunsten Letterblad (1840-1843); and the Vlaemsche Rederyker (1844).
In Belgium we have P. Willems and the Baron De Witte (long resident in France); in Holland, C. G.
2 For a different view see Willems, Droit public romain, p. 381 (Louvain, 1874).