Fairfield DNA Test results as of 6/09:
Below are the results of seven Fairfield descendants, five with documented lineage in the U.S. back to John Fairfield of Wenham, Mass. (Ted C. Fairfield, Chad W. Fairfield, Chad's grandfather Howard C. Fairfield, John Fairfield, and Roy S. Fairfield), and two from Canadian lines that may or may not be direct descendants of the Massachusetts line (Paul W. Fairfield and James P. Fairfield).
John Leslie Fairfield's lineage is through John-Walter-Walter-Thaddeus-Thaddeus-Joel Lee-Charles Dexter-Walter Burr-Leslie-John Leslie), from Springfield/Belchertown, MA. Chad and Howard's Midwest line (John-Walter-Walter Jr.-Nathaniel-Joseph-Joseph Jr.-Joseph III-Sylvester W.-James C.-Howard C.-William H.-Chad W.).is from the Pittsfield, MA, branch of the John Fairfield descendants. Ted's California line is from the Woodstock, CT, branch of the John Fairfield family (John-Walter-William-Skipper-William-David-Jason-David-Corbin-Ted). Both lines are also descended from Walter Fairfield, eldest son of John Fairfield of Wenham. James is also in the Midwest, and he says his great-great grandfather was born in Upper Canada and came to the U.S. in 1854, but he has not yet been able to trace his Fairfield ancestry farther back. See the info below for help in understanding the DNA markers and data.
The first column, the haplotypes, confirms all the men are from Western European lines (as opposed to Semitic, Nordic, or Native American). Chad Fairfield, his grandfather (Howard C. Fairfield), John L. Fairfield, and Roy Fairfield have an exact DNA 12-marker match, which translates to a 99.9% chance of common ancestors. Ted and Paul have four mistmatching markers from the Midwest line, and James has three mismatches. On the other hand, Ted and James match on 11 out of 12 markers, and Ted and Paul match on 10/12. Likewise, Paul differs from James by only one marker. Some of the mismatches occur on markers that commonly shows fast mutation, but the column 4 (391) and 12 (389-2) mutations greatly reduce the possibility of common ancestors (see below).
Notes from Family Tree DNA about the data: It is obvious from our observation of 1,000s of samples that some markers change or mutate at a faster rate than others. While that actual "faster rate" has not yet been definitively calculated, not all markers should be treated the same for evaluation purposes. The markers in red have shown a faster mutation rate then the average, and therefore these markers are very helpful at splitting lineages into subsets, or branches, within your family tree. Explained another way, if you match exactly on all of the markers except for one or a few of the markers we have determined mutate more quickly, then despite the mutation this mismatch only slightly decreases the probability of two people in your surname group who match 11/12 or even 23/25 of not sharing a recent common ancestor.
In conclusion, more participants are needed to determine evidence of DNA strains of Fairfield descendant lines. If you know of any male Fairfield still bearing the surname, please have them submit their DNA for our project at www.familytreedna.com