The Clifford family name

My last name were does it come from .It comes from England if you separate the name you have two words in English. A cliff -a very steep, vertical, or overhanging face of rock, earth, or ice and
ford-a shallow part of a body of water that may be crossed by wading.
But it was a Norman family that adopted the name after they had invaded England. You ask who where these Normans. Being originally from Scandinavia they were called Norseman or Vikings.They went looking for plunder and also land to settle throughout Europe. A large group of Vikings eventually settled in the northern part of France.This part of France would later bear their name that even today is called Normandy. William the Conqueror who claimed the English throne for himself struck out from Normandy to settle this dispute. In 1944 during World War 2 the reverse would happen when the Allies invaded Normandy from England that was then occupied by Germans. By the time the Normans had conquered England in 1066 they had been assimilated in their French surroundings and had lost most of their Scandinavian roots. They spoke French and this had a great influence on the English language. Adding many new words to what was then the way English was spoken and written. Even now, after a thousands years, the Norman influence on the English language is still visible.
 Ok back to the Clifford name, a powerful Norman married a local English lady. After this marriage he inherited a castle from her dowry. This castle was called Clifford Castle, so he changed his name to Walter de Clifford. That is how my name got started and has come down to the present generation. Though in ruins, Clifford Castle still exists today.