How Common Is the Last Name Koby?
An estimated 651 people in the United States share the surname Koby. That's about 1 in 526,504 Americans. This data comes from the 2010 U.S. Census Bureau surname frequency tables.
This page covers the Koby 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 Koby.
Estimated Americans with this Surname
651
About 1 in 526,504 people in the U.S.
Census Rank
#38,801
Frequency Rate
0.19
per 100,000 people
Census Count
569
2010 Census
Data Source
2010
U.S. Census Bureau
Ancestry and Ethnicity for Koby
The Koby surname is most commonly associated with people who identify as White (93.85%). The next largest groups are Black (1.76%) and Hispanic (1.76%).
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.
Is the Surname Koby More or Less Common Than Before?
Between the 2000 and 2010 census releases, the surname Koby became less common in the United States. Both the raw count and the population-adjusted frequency moved down.
The headline number to watch is per 100,000 people. That tells you whether the surname became a bigger or smaller share of the country overall, even if the raw number of people with the name also changed.
Census Count
Per 100,000 People
Popularity summary
Use this table to compare rank, total count, and population-adjusted frequency side by side.
| Metric | 2010 | 2000 | Change |
|---|---|---|---|
| Rank | #38,801 | #36,572 | -5.91% |
| Count | 569 | 577 | -1.40% |
| Per 100,000 | 0.19 | 0.21 | -10.00% |
If the raw count rose but the per-100,000 number fell, the surname still became less common relative to the size of the U.S. population. That is why the frequency rate usually tells the clearer story.
Recorded ancestry change
These percentages show how the Census profile for this surname shifted between the two surveys.
| Ancestry | 2010 | 2000 | Change |
|---|---|---|---|
| White | 93.85% | 95.67% | -1.92% |
| Black | 1.76% | 1.56% | 12.05% |
| Asian and Pacific Islander | 1.41% | N/A | N/A |
| American Indian and Alaska Native | 0.00% | N/A | N/A |
| Two or More Races | 1.23% | 0.87% | 34.29% |
| Hispanic | 1.76% | 0.87% | 67.68% |
These percentages come from self-reported Census data. They describe how the recorded makeup of people using the surname Koby changed between 2000 and 2010, not the deeper family origin of every bearer of the name.
First Name + Koby Combinations
How many people share a full name with Koby as the last name? Click a combination below to see the estimate, or search any pairing.
Koby Surname: Questions and Answers
How common is the last name Koby?
Koby is the #38,801 most common surname in the United States, with an estimated 651 people sharing this last name. It appears at a rate of 0.19 per 100,000 Americans.
What ethnicity is the surname Koby?
The Koby surname is most commonly associated with people who identify as White (93.85%). The next largest groups are Black (1.76%) and Hispanic (1.76%). 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] Koby are there?
We can estimate any first + last name combination. Popular examples: Michael Koby, James Koby, John Koby. 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
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