When analyzing the ethnicity of those bearing the surname Seo, according to the Decennial U.S. Census, the vast majority identify as Asian/Pacific Islander. In 2000, this group represented 94.35% of all Seos, and this figure slightly increased to 95.66% in 2010. Those identifying as having two or more ethnicities dropped by 41% over the decade, whereas the proportion identifying as White decreased by 21.20%. A small percentage of Seos identified as Hispanic, which also saw a slight decline of 21.05%. Interestingly, there were no individuals identifying as Black or American Indian and Alaskan Native in 2000. However, by 2010, these groups began to appear, albeit still representing very small proportions of the Seo population.
| 2000 | 2010 | Change | |
|---|---|---|---|
| Asian/Pacific Islander | 94.35% | 95.66% | 1.39% |
| White | 2.83% | 2.23% | -21.2% |
| Two or More Races | 1.78% | 1.05% | -41.01% |
| Hispanic | 0.76% | 0.6% | -21.05% |
| Black | 0% | 0.38% | 0% |
| American Indian and Alaskan Native | 0% | 0.07% | 0% |
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 Seo is Korean, which comprises 86.3% of all ancestry found in people with the surname. The next two most common ancestries are Japanese (6.4%) and British & Irish (2.6%). Additional ancestries include French & German, Italian, Angolan & Congolese, Ghanaian, Liberian & Sierra Leonean, and Iranian, Caucasian & Mesopotamian.
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| ANCESTRY BREAKDOWN | COMPOSITION |
|---|---|
| Korean | 86.3% |
| Japanese | 6.4% |
| British & Irish | 2.6% |
| Other | 4.7% |

Haplogroup O1b2a, a branch of haplogroup O, is closely related to several haplogroups that are commonly found in Japan. Haplogroup O is closely associated with Kyushu, Japan's third largest island, and makes up over half of all men in Japan. Although haplogroup O is prevalent in Japan, it likely only entered Japan during the Yayoi expansion about 2,300 years ago. During the Yayoi expansion, people entering from the Korean Peninsula brought wet rice agriculture, weaving technology, and metalworking technology to Japan. The Yayoi expansion began on the island of Kyushu, where haplogroup O is very common today. It is possible that some of the early members of O1-F3356 were involved in this major shift, which quickly and dramatically altered Japanese culture.
Members of haplogroups B4 and B5 are quite frequent in both northern and southern Han Chinese populations. The Han people, who all share the same language and similar cultural practices, are the largest ethnic group in the world, with about 1.2 billion people. Historical evidence shows that Han people are descendants of the ancient Huaxia tribes that come from northern China, centered in Zhongyuan, China's Central Plain. The spread of Han people, language and culture from northern to southern China only occurred in the last 2,000 years, and was likely driven by warfare and famine in the north.

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