The ethnic identity associated with the surname Guillot also saw some changes between 2000 and 2010, according to data from the Decennial U.S. Census. In 2000, 91.10% of Guillots identified as White, but this percentage decreased to 88.06% by 2010. During the same period, there was an increase in the percentage of Guillots identifying as Asian/Pacific Islander (from 0.39% to 0.74%), Two or more races (from 0.96% to 1.19%), Hispanic (from 3.87% to 5.45%), and Black (from 3.32% to 4.22%). The only decrease was seen in the American Indian and Alaskan Native category, where the proportion fell from 0.37% in 2000 to 0.34% in 2010.
| 2000 | 2010 | Change | |
|---|---|---|---|
| White | 91.1% | 88.06% | -3.34% |
| Hispanic | 3.87% | 5.45% | 40.83% |
| Black | 3.32% | 4.22% | 27.11% |
| Two or More Races | 0.96% | 1.19% | 23.96% |
| Asian/Pacific Islander | 0.39% | 0.74% | 89.74% |
| American Indian and Alaskan Native | 0.37% | 0.34% | -8.11% |
NomOrigine computes an ancestry breakdown for each customer. People may have ancestry from just one population or they may have ancestry from several populations. The most commonly-observed ancestry found in people with the surname Guillot is British & Irish, which comprises 36.3% of all ancestry found in people with the surname. The next two most common ancestries are French & German (35.0%) and Spanish & Portuguese (13.2%). Additional ancestries include Italian, Indigenous American, Nigerian, Ghanaian, Liberian & Sierra Leonean, and Eastern European.
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| ANCESTRY BREAKDOWN | COMPOSITION |
|---|---|
| British & Irish | 36.3% |
| French & German | 35.0% |
| Spanish & Portuguese | 13.2% |
| Other | 15.5% |

One of the many populations harboring members of haplogroup O1b1a1a1a1 is the Cham ethnic group, a group of people who speak Austronesian languages in Mainland Southeast Asia. Austronesian languages make up a language family that is extremely large and widespread, comprising over 350 million people on islands such as Madagascar, Easter Island, and many others. However, Austronesian languages are less common on mainland Asia, with a notable exception being the Chamic language. Research suggests that ancestors of the Cham people migrated from Southeast Asian islands to the mainland around the year 500 BCE, and that early Cham populations quickly began mixing with indigenous southern Vietnamese populations. As a result, the Chamic language now has words that were borrowed from languages spoken by indigenous Vietnamese people. It is likely that an ancestral Kinh population was one of the populations that mixed with the Cham people shortly after their migration to mainland Asia.
Because it is so dominant in the general European population, haplogroup H also appears quite frequently in the continent's royal houses. Marie Antoinette, an Austrian Hapsburg who married into the French royal family, inherited the haplogroup from her maternal ancestors. So did Prince Philip, Duke of Edinburgh, whose recorded genealogy traces his female line to Bavaria. Scientists also discovered that famed 16th century astronomer Nicolaus Copernicus traced his maternal lineages to haplogroup H.

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