His son Albert Georg Sijthoff continued in his father's footsteps, taking over as publisher of the Haagsche Courant.
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The family's publishing company continues to operate today as Luitingh-Sijthoff.
Willem de Kooning | Willem Dafoe | Willem Blaeu | Albertus Magnus | Willem Janszoon | Willem Mengelberg | Willem Roggeman | Herman Willem Daendels | Willem Drees | Willem-Alexander of the Netherlands | Willem van Otterloo | Willem Schouten | Willem Kloos | Willem Klein | Willem II (football club) | Willem II | Willem de Vlamingh | Willem Buiter | John Willem Gran | Willem Verstegen | Willem van Hoogstraten | Willem van Enckevoirt | Willem van de Sande Bakhuyzen | Willem Sassen | Willem P.C. Stemmer | Willem Frederik Hermans | Willem C. Vis Moot | Willem B. Drees | Willem Abraham Wythoff | Pieter Willem Korthals |
Bob Sijthoff, descendant of Albertus Willem Sijthoff who sued Wikimedia in the Netherlands in 2008
Albert Georg Sijthoff (1853–1927), son of Albertus Willem Sijthoff and publisher of the Haagsche Courant