How Common Is the Last Name Guillermo?
An estimated 3,863 people in the United States share the surname Guillermo. That's about 1 in 86,951 Americans. This data comes from the 2010 U.S. Census Bureau surname frequency tables.
This page covers the Guillermo surname's frequency in the U.S. population, its rank among all American surnames, and a breakdown of ancestry and ethnicity data from the Census. You can also check how many people share any first + last name combination involving Guillermo.
Estimated Americans with this Surname
3,863
About 1 in 86,951 people in the U.S.
Census Rank
#9,581
Frequency Rate
1.15
per 100,000 people
Census Count
3,393
2010 Census
Data Source
2010
U.S. Census Bureau
Ancestry and Ethnicity for Guillermo
The Guillermo surname is most commonly associated with people who identify as Hispanic (55.03%). The next largest groups are Asian/Pacific Islander (35.34%) and White (4.39%).
Self-reported race and ethnicity from the 2010 U.S. Census Bureau surname tables. Some categories may be suppressed for privacy when sample sizes are small.
First Name + Guillermo Combinations
How many people share a full name with Guillermo as the last name? Click a combination below to see the estimate, or search any pairing.
Guillermo Surname: Questions and Answers
How common is the last name Guillermo?
Guillermo is the #9,581 most common surname in the United States, with an estimated 3,863 people sharing this last name. It appears at a rate of 1.15 per 100,000 Americans.
What ethnicity is the surname Guillermo?
The Guillermo surname is most commonly associated with people who identify as Hispanic (55.03%). The next largest groups are Asian/Pacific Islander (35.34%) and White (4.39%). This data comes from the 2010 U.S. Census Bureau surname tables, which include self-reported race and ethnicity breakdowns.
How many people named [First Name] Guillermo are there?
We can estimate any first + last name combination. Popular examples: Michael Guillermo, James Guillermo, John Guillermo. Search any combination on our homepage.
Where does this surname data come from?
Surname frequency data comes from the 2010 U.S. Census Bureau decennial surname tables. These list every surname appearing in the Census along with frequency rates and demographic breakdowns. Full methodology.
Search for a full name combination
How Many of Me