Explore the Family Name Guilliams
The meaning of Guilliams
Welsh: variant of Gwilliams, itself a variant of Gwilliam, with English excrescent -s.
Dictionary of American Family Names, 2nd edition, © Oxford University Press, 2022.
How common is the last name Guilliams in the United States?
According to the Decennial U.S. Census data, the surname Guilliams has seen an increase in popularity between 2000 and 2010. The ranking of this surname rose from 15,870 in 2000 to 15,363 in 2010, marking a change of 3.19%. In terms of count, the number of people with Guilliams as their last name also increased by 13.43% during this period, from 1,683 in 2000 to 1,909 in 2010. This led to a slight rise in the proportion per 100k people, which went up by 4.84%, from 0.62 in 2000 to 0.65 in 2010.
| 2000 | 2010 | Change | |
|---|---|---|---|
| Rank | #15,870 | #15,363 | 3.19% |
| Count | 1,683 | 1,909 | 13.43% |
| Proportion per 100k | 0.62 | 0.65 | 4.84% |
Race and Ethnicity of people with the last name Guilliams
In terms of ethnic identity, based on the same Decennial U.S. Census data, there have been noticeable shifts between 2000 and 2010. The majority of individuals with the last name Guilliams identify as White, although this percentage decreased from 94.24% in 2000 to 90.15% in 2010. On the other hand, those identifying as Black saw a significant increase, rising from 1.60% in 2000 to 5.71% in 2010. The percentages of Guilliams identifying as Hispanic remained stable at 2.20%, while those identifying as Asian/Pacific Islander and American Indian and Alaskan Native slightly decreased. The group that reported having two or more ethnic identities saw a small increase, from 1.01% in 2000 to 1.05% in 2010.
| 2000 | 2010 | Change | |
|---|---|---|---|
| White | 94.24% | 90.15% | -4.34% |
| Black | 1.6% | 5.71% | 256.88% |
| Hispanic | 2.2% | 2.2% | 0% |
| Two or More Races | 1.01% | 1.05% | 3.96% |
| American Indian and Alaskan Native | 0.59% | 0.58% | -1.69% |
| Asian/Pacific Islander | 0.36% | 0.31% | -13.89% |