Guilliam is a given name. Notable people with the name include:
*
Guilliam van Deynum
Guilliam van Deynum or Guilliam van Deynen (Antwerp, c. 1575 - Brussels, after 1624) was a Flemish people, Flemish painter, Limner, illuminator and miniaturist. He was mainly a portrait artist. After training in Antwerp he spent in the early 17 ...
( 1575–after 1624), Flemish painter, illuminator and miniaturist
*
Guilliam du Gardijn (1595/1596–1647/1657), Dutch painter
*
Guilliam Visagie
Guilliam Visagie (born about 1751; still alive in 1793) was a trekboer who settled in southern Namibia about 1786. He is considered to have been the first person of European ancestry to have settled in the country.
Visagie was born about 1751 in t ...
( 1751–after 1793), Cape Colony trekboer
{{given name