This is a genuine Olde English or possibly Olde British (pre - Roman) former personal name. Originally spelt 'Deda or Dada' and translating as 'The Deed' it was a name probably given to a warrior, one who performed deeds of valour the name development includes Hugo Dede in the Pipe Rolls of Devon in 1210 A.D., Thomas Dade, recorded in Warwickshire in 1275, whilst the patronymic 'son of Dade' appears as Dady, Deddy (1690) Deady (1809) Dadey (1815) Daydy (1834) and Daddy (1697). In 1665 Margeria Deedy was christened at Cannoch Church on November 19th of that Year. The first recorded spelling of the family name is shown to be that of William Dady, which was dated 1624, married Elizabeth Humphrey at Stepney, London, during the reign of King James I of England and VI of Scotland 1603 - 1625. 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.