On 22 January 1437 William married Walburga of Meurs, Lady of Baer and Lathum, daughter of Frederick IV, Count of Moers (†1448), and Engelberta of Cleves, by whom he had 4 daughters and 3 sons: •
John III of Egmont, Count of Egmond, stadtholder of Holland, Zeeland and West-Friesland; •
Frederik of Egmont, Count of Buren and Leerdam, Lord of IJsselstein; •
William of Egmont, stadtholder of Guelders. • Anna, married Bernard van Bentheim • Elisabeth, married Gijsbrecht van Bronckhorst • Walburgia, a nun • Margaretha, married Jan van Merode Besides the children from his marriage Van Egmont had four children by different women: • Nicholas of Egmond, was captured on the Valkhof 1478-1481 together with his half-brothers Frederick and William. • Hendrik van Egmond ( -1511), whose mother was Aleid Kreijnck • Frederik van Egmond • Hendrika van Egmond, she married Willem van Tuyl Bulcke Steijn (-1449). He was a son of Willem Willemsz of Tuyll and Maggie Mate Nesse, daughter of Adriaen van Nesse Mate (1385-1435) He is buried next to his brother, Duke Arnold of Gelderland.