Catherine, there is no such place as "Halveda". The only place I know of that closely resembles that is a village called Halverde. Halverde is located in the northernmost part of what was until 1945 the Prussian province of Westphalia (in German: Westfalen). Halverde is about 35 miles directly north of the city of Münster, Westphalia's former capital.
Following World War II and the break-up of the huge state of Prussia (in German: Preussen; capital: Berlin), the northern half of the Prussian Rhineland or Rhine Province (capital: Koblenz), the Prussian province of Westphalia, and the very small state of Lippe (capital: Detmold) combined to form today's German state of North Rhine-Westphalia (in German: Nordrhein-Westfalen), with the city of Düsseldorf in the Rhineland as its capital.
Halverde is no longer an independent village. Halverde is now part of the town of Hopsten. Hopsten is a town of about 8000 people, of whom about 1200 live in Halverde.