For many years, the Van Horn family legend for those who descended from Christiaen Barents Van Hoorn was our family "originated in Hoorn, Holland." That is exactly what it was - a legend - a myth! Here is where we really are from.
From The American Genealogist, V47, pages 173-175
So Are Frisians German or Dutch?
The Frisians are a Germanic ethnic group native to the coastal regions of the Netherlands and northwestern Germany. They inhabit an area known as Frisia and are concentrated in the Dutch provinces of Friesland and Groningen and, in Germany, East Frisia and North Frisia (which was a part of Denmark until 1864).