An island of stone above the valley, the Manor Home D’Marsarac sits upon a green promotory above the farming valley below. From this island in the sky (an illusion created by the thick morning fog) various noble families have administered to this fertile valley for centuries.
The Haven Fortress, the name suggests protection and vacation, but it is far more then that…
Patterns in surnames: There are many ways a surname could have evolved over centuries. One possibility is migration. A Roman name may have traveled to France and hence to England where it was later Anglicized. Case in point - the surname Lawrence went from Laurentius (Roman) to Laurent (French) to Lawrence (English) and then to Lowry (Scottish). There is also natural etymological evolution. For example, a Middle English spelling may have evolved to a modern English spelling (e.g. Stiward to Stewart). Where did your character's Surname come from?