This most interesting surname is probably a dialectal variant of "Dacey", which itself derives from two possible origins. Firstly it may be a variant spelling of "Daw", a pet form of the Hebrew male personal name "David", beloved, a popular personal name in Britain by virtue of its being the name of the 16th Century patron saint of Wales. Also in some instances, "Dacey" is a variant spelling of "Deasy", which is the Anglicized form of the Gaelic name "Deiseach", a name given to one of the Decies i.e. a native of County Waterford, a name which is now mainly found in County Cork. The Deasy's of County Cork are said to have derived their name from a child rescued from a massacre in the barony of Decies (Waterford) circa 1620 and who was protected by the O'Donovans and lived to have seven children. One Henry Daucy married Elizabeth Catcher at St. Dunstan's, Stepney London on April 25th 1626. Thomas Dease (1568-1652) became Bishop of Meath in 1622. One Doly Dacy, aged 26 yrs, an Irish famine immigrant left Liverpool aboard the "Nicholas-Biddle" on May 15th 1847 bound for New York. The first recorded spelling of the family name is shown to be that of Magdalen Dacy married Thomas Jonson, which was dated April 20th 1551, at St. Margaret's Westminster, London, during the reign of King Edward V1, known as "The Boy King", 1547 - 1553. 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.