For your added pleasure, I've transcribed the history, amending grammatical mistakes to make more sense of the passage.
A detailed history of England commenced from the Germanic invasions during the mid 5th century AD. During the 10th century, Britain was united into one Kingdom with all existing Anglo-Saxon communities merging after the invasion in 1066 of William of Normandy who later became William I of England. The Normans brought with them the feudal system which was a social system of rights and duties based on land tenure.
The English surname Shirley is of local origin. Local surnames were derived from the place where a person once lived, or a prominent local geographical feature. Perhaps a hill identified one person from another who lived near a bridge, river, lake, etc. Many of these names were preceded by a preposition such as “de”, “at”, “by” or “in”. These tended to lapse in later years. In this case the name means "of Shirley". There are a number of places of this name located in the counties Derbyshire, Hampshire and Surrey and the West Midlands. The place name itself is derived from the Old English words "scir" meaing bright and "leah" which means wood clearing.
It is often assumed that surnames were adopted by the user, when in fact few were, as no need existed for the individual to distinguish himself from his peers. Names were used mainly to assist in the ready identification of a person for the purposes of tax payment, church records, transfer of land, military service and any official documentation.
The earliest recorded references to the surname "Shirley" or a variant appear to be found in the English documents from at least the 13th century when William de Schirle was mentioned in the Assize Rolls of Yorkshire in 1219 AD. A century later, Ralph de Shirleye was recorded in the Feet of Fines of Warwickshire in 1318. Later in the century, Johannes de Scherlay and Willelmus de Scherlay were listed in the Poll Tax of Yorkshire in 1379. More recently, records show that George Schyrlye of Leicestershire was enrolled as a student of the University of Oxford in 1573, as was John Shirley of Sussex in 1582.
Below, you can see that there is some contention about what the Shirley coat of arms looks like, but the basic elements (Saracen's head and banner) are to be seen in each representation.