How interesting! I only discovered a few months ago whilst researching the family that my gggrandmother was Susannah Turk, born Chedworth Glos. 1768. She married Richard Haviland of Winstone Glos.in Winstone 1791.
Susannah was the daughter of John Rogers Turk 1727 Withington and he I think was the son of Nicholas Turk 1698 Chedworth and Sarah Rogers of Chedworth. I don't know whether you are acquainted with the area but Chedworth and Winstone are 2 very small villages only a few miles apart.Unfortunately there were 2 Richard Havilands born within months of each other in Winstone and as yet I am not certain to which parents he belongs. There are John and Mary Haviland whose son was born 3/7/1767 and Thomas and Mary haviland and their son was born 9/10/1768.John Rogers Turk had 2 brothers Charles and Nicholas.
I hope you can get your head around this and I look forward to hearing from You.