Harris Surname DNA Project
The Harris Surname DNA Project is one of the larger DNA surname projects with over 250 participants.  It was created as a cooperative organization to develop a collection of Harris family groups who descend from various male Harris ancestors in order to use genealogical DNA testing to compare Y-DNA to discover familial and non-familial relationships.  The first test kit was submitted in 2001; the project was created in 2003 after several other DNA kits had been submitted for comparison.  Some variant spellings of Harris which are part of the project include: Harries, Herries, Harriss, Harrys, Herrys, Harras, Herrick, etc.  In a number of instances the Harris surname appears to be English and Welsh in origin.  It is very common in southern England and South Wales as a patronymic from the medieval English personal name Harry (pet form of Henry), meaning "son of Harry."  But other Harris families seem to have originated in Germany, France, and other countries.
The Harris Surname DNA Project administrators are genealogists who serve in a volunteer capacity and receive no financial or other compensation.  They help maintain the project pages and results as well as answer general questions.  The official testing company for the Harris DNA Study is Family Tree DNA.  The Project administrators also manage Harris test results submitted to DNA Heritage.

# Frequency
The Harris surname (not including variant spellings) ranked as the 15th most common surname in the U.S. as surveyed in the 1990 Census (behind Smith, Johnson, Williams, Jones, Brown, Davis, Miller, Wilson, Moore, Taylor, Anderson, Thomas, Jackson, and White).
In the 2000 Census, the 25 most common surnames in rank are:  Smith, Johnson, Williams, Brown, Jones, Miller, Davis, Garcia, Rodriguez, Wilson, Martinez, Anderson, Taylor, Thomas, Hernandez, Moore, Martin, Jackson, Thompson, White, Lopez, Lee, Gonzalez, Harris, and Clark.  Harris ranks as the 24th most common surname in the United States.
Harris is the 22nd most common surname in England, Wales and the Isle of Man (behind Smith, Jones, Williams, Taylor, Brown, Davies, Evans, Wilson, Thomas, Johnson, Roberts, Robinson, Thompson, Wright, Walker, White, Edwards, Hughes, Green, Hall, and Lewis).

# Probable origins for the Harris family of Essex
One branch of Harrises (the family residing in Essex, England in the 1500s) claims to derive their surname from the French term Le Herisse.  Previously, as early as 1000 A.D., this family had been nicknamed Crispin, (Latin) meaning sticking-up hair.  The French translation of Crispin is Le Herisse.  A paternal ancestor, Crispin de Bec, son of Guillaume de Bec (918-1000) was bestowed the nickname of Crispin, meaning curly-headed. This Crispin de Becs son, Guy Le Herisse de Bailleul, was perhaps the first to assume the French translation of the name.  This Crispin family reportedly descends from a brother of Rolf Ganger Rollo named Hrollaug Rognvaldsson (aka Hugh Barbatus), both sons of Rognvald The Wise Eysteinsson. Among numerous branches, some related families migrated to the British Isles and were known as de Heriz and Heris during the 11th & 13th centuries in Nottingham and Derby. The family was also anciently known as Herries in Wales and Scotland.
The ancient Le Herisse ancestor, Guy de Bailleul, is recorded as holding Harcourt in France.  Crispin, Le Herisse, and de Harcourt were used interchangeably at various periods of time.  One of Guys descendants, Ivo de Harcourt, who is often confused with a different Ivo de Harcourt of another family, began using the name of Heris in Nottingham during the 12th century. This appears to be the English ancestor of the Y-DNA I1a haplotype Harris families.
Other branches of this group of Harrises took various surnames during the period of surname formation in the 11th through 13th centuries. From various DNA studies of related patrilineal families tracing back to these same medieval ancestors, it appears that some branches of the following families also trace back to a common ancestor with this Harris family: de Bailleul, Crispin, de Clare, de Montfort, Marshal, Beaumont, Mauvoisine (de Hercy), Rosny, de Colleville, de Ifferley, Stanhope, Douglas, and Harcourt among others.
This group of Harrises which settled in Essex, England, has a corresponding Yahoo! Group for genealogy discussion called Harrisline.

# Other Harris DNA projects
The Harris-2 DNA Study is also being conducted by Family Tree DNA.  It is centered around a separate group of Harrises whose members were tested to find out how much Native American blood was in them.
There is also a Harris-Calvert DNA Study being conducted by Family Tree DNA which revolves around a group of Harrises that descend from family members whose name may have originally been CALVERT, as some of the names in early records are shown as Calvert alias Harris, Calvert alias Harrison, Harris alias Calvert, and Harrison alias Calvert. This seems to indicate that at least one family member of this group had more than one set of parents. This family group appears to descend from three brothersThomas, George, and Burr Calvert, sons of John Calvert (ca. 1692-1731) of early Virginia. Their mother is reported to be Jane Harrison. With DNA testing, and if a strong match can be found with a Harris, Harrison, or Calvert, it is possible that any questions of paternal origin may be solved.
The Calvert Surname has a corresponding Yahoo! Group for genealogy discussion.

# Y chromosome (Y-DNA) testing
Of interest is that one branch of Harrises in the United States used the name of Harris/Harrison alias Calvert and Calvert alias Harris/Harrison in the 1700s in Virginia.  In later generations the name has been shortened to Harris.  It is possible this branch of Harrises are actually Calverts.
Another similar family is the Tyner family from the late-1600s and early-1700s in Virginia.  Descendants now carry the surname of Tyner, however they descend from a John Harris with a mistress, Sarah Tyner.  DNA testing confirms that this Tyner family descends from the Harris family through the male line.
Because many Harris surname researchers have exhausted traditional genealogy research methods without identifying their elusive Harris ancestor, this project combines genetics and genealogy in an effort to break through the proverbial "brick wall."

# Y-DNA test results
The Harris Y-DNA results chart showing brief lineages and SNPs or DNA marker values for various kits submitted to the Harris Surname DNA Project is divided up into groups of DNA donor kits which appear to be related.  Each grouping shows a modal value with the kits in each group matching closely with the modal (or proposed DNA values for a possible common ancestor).  Other kits are still unmatched.  On the chart, haplogroups in green have been confirmed by SNP testing. Haplogroups in red have been predicted by Family Tree DNA based on unambiguous results in the individual's personal page.  SNPs are changes to a single nucleotide in a DNA sequence.  SNPs or DNA markers are named with a letter code and a number.  DNA markers shown in red are known to mutate faster than other markers.
A Harris DNA mailing list is sponsored by Rootsweb.com.  A few of the kit groupings have corresponding Yahoo! Groups for discussion of topics related to that particular Harris DNA group or its reported ancestor(s).