Save Gender Masculine Usage Dutch (Rare), Kashubian, Silesian, Literature Pronounced Pron. WIL-əm(Dutch) [key] Other Forms FormsWilémk (Kashubian diminutive) Meaning & History Dutch variant of Willem and Kashubian and Silesian form of William. This is the name of a character in Patrick Rothfuss' book series, The KingKiller Chronicles.