With transposed names particularly those of (originally) foreign extraction and lacking genealogical confirmation, some conjecture is necessary. In this case the dialectual sound clearly suggests the Olde French locational name (de) Cazalet, a derivative of the Roman (Latin) 'Caza'- meaning 'a dwelling place' and a Huguenot refugee family of the 1680's. However it is possible that the name is a derivative of the French Chastelet, since one Hippolyte Chastelet was a Huguenot refugee in 1672 and was the Pastor of the French Church in Harwick. The first recorded spelling of the family name is shown to be that of Richard de Cazelet which was dated C1680, Provence, France during the reign of King Louis XIV, The Sun King, 1643 - 1715 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.