The meaning of Willem is "determined protector".
this is Dutch, so Willem= William Janszoon means son of Jans
Willem Elzenga's birth name is Willem Lodewijk Elzenga.
Willem Drieling's birth name is Willem Johannes Drieling.
Willem Mengelberg's birth name is Mengelberg, Josef Willem.
Willem Wilmink's birth name is Willem Andries Wilmink.
Willem Ward's birth name is Willem Luke Ward.
Willem van Beusekom's birth name is Willem Jacobus Marius van Beusekom.
Willem Paul Edelman's birth name is Willem Paul Franciscus Xaverius Edelman.
Willem Ruis's birth name is Klaas Ruis.
Willem Abel Janszoon is the Dutch explorer's full name.
Willem Dafoe's birth name is William J. Dafoe.
Willem Duyn's birth name is Wilhelmus Jacobus Duyn.