Willem Elzenga's birth name is Willem Lodewijk Elzenga.
Willem Drieling's birth name is Willem Johannes Drieling.
Willem Wilmink's birth name is Willem Andries Wilmink.
Willem Ward's birth name is Willem Luke Ward.
Willem Mengelberg's birth name is Mengelberg, Josef Willem.
Willem Ruis's birth name is Klaas Ruis.
Willem Duyn's birth name is Wilhelmus Jacobus Duyn.
Willem Dafoe's birth name is William J. Dafoe.
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 Elsschot's birth name is Alphonsus Josephus de Ridder.
Willem Vermeend's birth name is Wilhelmus Adrianus Franciscus Gabril Vermeend.
Willy Claes's birth name is Willem Werner Hubert Claes.