The Kingdom of Hanover was not named after the family. Rather, both the Kingdom and the House of Hanover were named after the capital city of Hanover. This is

The Kingdom of Hanover was not named after the family. Rather, both the Kingdom and the House of Hanover were named after the capital city of Hanover. This is quite common for Western European royalty. Because they didn't have actual surnames, they used the location of the family seat. For example, the House of Windsor was named after Windsor Castle. The House of Habsburg-Lorraine was named after Habsburg Castle and the region of Lorraine. The House of Hohenzollern was named after Hohenzollern Castle.