GAZ6078 on Family Tree Circles

I AM LOOKING FOR INFORMATION CONCERNING A JOHN CLARK born circa 1730 I believe in Great Waltham essex? he married a Sarah ? and had A SON CALLED SAMUEL BORN IN 1752 who married a Mary Chapman and had a son called Charles,the rumour in the family is that we are descended from Native Americans who settled in the Great Waltham & Great Leighs area, but I can find nothing to confirm this. My Great Grandfather Alfred DOB 1847 married Eliza Sachs
D0B 1852 they had a son Herbert John Clark/e DOB 1878 and it is through him you can see the Native american traits & colour. Any help you can give would be greatly appreciated.

Apologies for the Caps my finger kept slipping.