This very interesting name is the Yorkshire medieval form of Sybil, the popular female personal name of the twelth century. The origination is Roman (Latin) where the word was a form of title for a person who could interpret the wishes of the Gods! As a Baptismal name, Sybil, was introduced by the Normans after the 1066 Invasion and many variants were developed which included Sibylla, Sibyllina, Sibille and Sibley, the latter being still found occasionally and the origination of the modern surname. The name development has included Stephen Sibry c. 1300 of York, Thomas Sybry 1379 The Yorkshire Poll Tax Rolls, and 1687, Katherine Sibrey, married John Masters at Canterbury. The first recorded spelling of the family name is shown to be that of Alan Sibri which was dated 1273 The Pipe Rolls of Yorkshire during the reign of King Edward 1 the Hammer of the Scots 1272-1307 Surnames became necessary when governments introduced personal taxation. In England this was known as Poll Tax. Throughout the centuries, surnames in every country have continued to "develop" often leading to astonishing variants of the original spelling.