As with many Old English personal name such as "Alfgar", composed of the disparate elements "aelf", elf and "gari", spear, most double-barrelled names are the result of a marriage between two families, where the resulting name has no overall meaning, but the separate elements have their own meaning and derivation. In this instance the name Teasdale, is of Anglo-Saxon origin, and is a regional name from Teesdale in Counties Durham and Yorkshire, so called from the river Tees, and derived from a British (pre Roman) river name, related to the Welsh "tes", and the Irish Gaelic "teas", meaning heat or sunshine, in the sense of boiling river. Markie is also locational, or dialectal variant of Markle, from a place so called near Edinburgh, Scotland. One Michael Teasdale was christened on October 30th 1630 at Harworth on Tees, Durham and Isobell Markie married Andrew Williamson on September 16th 1670 at Corstorphines Midlothian, Scotland. The first recorded spelling of the family name is shown to be that of Walter de Tesedale, which was dated 1235 - 1236, in the Assize Rolls of Durham, during the reign of King Henry 111, known as "The Frenchman", 1216 - 1272. 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.