Van Roijen was married to Anne Snouck Hurgronje, a daughter of Aarnout Marinus Snouck Hurgronje.
 Together, they were the parents of two sons, Jan Herman and Willem, and two daughters, Tina van Notten and Digna van Karnebeek.
 While in America, they owned a 300-acre farm in Warrenton, Virginia.

He died, aged eighty-five, on 16 March 1991 at Wassenaar in South Holland.
Van Roijen was married to Anne Snouck Hurgronje, a daughter of Aarnout Marinus Snouck Hurgronje.  Together, they were the parents of two sons, Jan Herman and Willem, and two daughters, Tina van Notten and Digna van Karnebeek.  While in America, they owned a 300-acre farm in Warrenton, Virginia.
He died, aged eighty-five, on 16 March 1991 at Wassenaar in South Holland.
Herman van Roijen