Willem & Jan

Willem (Dutch pronunciation: [ˈʋɪləm] ) is a Dutch and West Frisian masculine given name. The name is Germanic, and can be seen as the Dutch equivalent of the name William in English, Guillaume in French, Guilherme in Portuguese, Guillermo in Spanish and Wilhelm in German. Nicknames that are derived from Willem are Jelle, Pim, Willie, Willy and Wim.