This is a German locational surname. It originates from a place called Biesingen in the Saarland, whose meaning is probably the place of the bent grass. This is a type of spiky grass found in many areas subjected to strong wind and usually found on the coast. Locational surnames are "from" names. That is to say names given to people for easy indentification after they left their original homes to move somewhere else. Given that over the centuries writing and spelling were at best erratic and that local dialects very thick, often lead to the development of "sounds like" spellings. At various times the place name and surname seems to have been Bisingen and Bissingen which would describe a person from Biesingen, whilst the surname as Bisinger and the later Biesinger describes somebody who still lives there, or at least still claims association with the place. The first known recording in surviving German charters of the medieval period is believed to be that of Willy Bisinger of Mengen in Saulgau in the year 1410.