2000
#132,259
National surname rank
Recorded bearers 118
First available Census row
Per 100,000 0.04
Very Rare Last name
Mastros
A Greek occupational surname meaning "craftsman" or "master builder".
According to the 2020 US Census Bureau surname tables, roughly 138 Americans carry the last name Mastros. That puts it at #142,049 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,483,727 residents).
This page is the full Name Census profile for the Mastros surname. You will find the Census Bureau frequency data, a multi-census history view, an ancestry and ethnicity breakdown based on self-reported demographics, the name's meaning and origin where available, and answers to the most common questions people ask about this surname.
Bearers in the US
138
1 in 2,483,727
Census rank
#142,049
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
120
very rare in the US
Popularity narrative
The Census Bureau recorded 120 bearers of the surname Mastros in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 142049th position in the national surname ranking.
Among Census respondents with the surname Mastros, the largest self-reported group is White at 86.7%. The next largest groups are Hispanic (8.3%) and Two or More Races (2.5%).
Origin
Meaning and origin of Mastros
The surname Mastros has its origins in Greece, where it first emerged in the 15th century. It is derived from the Greek word "Mastros," which means "master" or "craftsman." This suggests that the name was initially given to individuals who were skilled in a particular trade or craft.
One of the earliest recorded instances of the name Mastros can be found in a document from the island of Crete, dated 1483. This document mentions a certain Georgios Mastros, who was a prominent merchant and landowner in the region.
During the Byzantine Empire, the name Mastros was often associated with individuals who held positions of authority or were considered experts in their respective fields. For instance, a manuscript from the 11th century refers to a scholar named Ioannis Mastros, who was renowned for his knowledge of philosophy and theology.
In the 16th century, the Mastros surname began to spread beyond Greece, as Greek communities established themselves in various parts of the Mediterranean region. One notable figure from this period was Nikolas Mastros, a successful merchant who settled in Venice in the late 1500s.
As the centuries passed, the Mastros surname continued to be carried by individuals of Greek descent, many of whom made significant contributions to various fields. For example, in the 19th century, Dimitrios Mastros was a prominent Greek revolutionary who played a key role in the Greek War of Independence against the Ottoman Empire.
Another noteworthy individual bearing the Mastros surname was Georgios Mastros, a renowned architect who lived in the early 20th century. He was responsible for designing several iconic buildings in Athens, including the National Library of Greece and the Academy of Athens.
Throughout history, the Mastros surname has been associated with a variety of place names and older spellings. In some regions of Greece, it was sometimes written as "Mastrou" or "Mastropoulos," reflecting local dialects and naming conventions.
While the Mastros surname has its roots in Greece, it has since spread to other parts of the world, carried by Greek emigrants and their descendants. Individuals with this surname can be found in various countries, including the United States, Australia, and Canada, among others.
Demographics
Ancestry and ethnicity for Mastros
Among Census respondents with the surname Mastros, the largest self-reported group is White at 86.7%. The next largest groups are Hispanic (8.3%) and Two or More Races (2.5%).
The bar chart below shows how Mastros bearers described their own race and ethnicity on the 2020 Census form. The Census Bureau groups responses into six broad categories: White, Black or African American, Hispanic or Latino, Asian and Pacific Islander, American Indian and Alaska Native, and Two or More Races. When a category has too few respondents for a given surname, the Bureau suppresses the figure to protect individual privacy, which is why some names show fewer than six slices.
Percentages are shown for every Census year so the breakdown stays comparable over time. When the source file also includes raw headcounts, Name Census shows those alongside the percentages in the legend.
Keep in mind that these are self-reported numbers. A person's surname does not determine their race or ethnicity, and the distribution you see here reflects the specific population who happened to carry the Mastros surname at the time of the 2020 Census, not any inherent property of the name itself.
- White86.7% · 104
- Hispanic or Latino8.3% · 10
- Two or more races2.5% · 3
- American Indian and Alaska Native1.7% · 2
- Black or African American0.8% · 1
Timeline
Historical Census data for Mastros
Mastros appears in 3 published Census surname files: 2000, 2010, 2020. The cards below show how the name's rank and bearer count changed across each release.
2010
#130,610
National surname rank
Recorded bearers 130
+12 bearers (+10.2%)
Per 100,000 0.04
Rank movement Up 1,649 places
2020
#142,049
National surname rank
Recorded bearers 120
-10 bearers (-7.7%)
Per 100,000 0.04
Rank movement Down 11,439 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #132,259 | 118 | 0.04 | First available Census row | First available Census row |
| 2010 | #130,610 | 130 | 0.04 | +12 bearers (+10.2%) | Up 1,649 places |
| 2020 | #142,049 | 120 | 0.04 | -10 bearers (-7.7%) | Down 11,439 places |
For 2020, the Census Bureau published race and Hispanic-origin columns as counts rather than percentages. Name Census converts those counts back into shares so the ancestry section stays comparable with the older surname files.
Year on year
2010 vs 2020 Census
How has the Mastros surname changed between Census years? The chart shows bearer count side by side, and the table compares rank, count, and frequency.
Census year comparison
20102020
| Metric | 2010 | 2020 | Change |
|---|---|---|---|
| Rank | #130,610 | #142,049 | -8.8% |
| Count | 130 | 120 | -7.7% |
| Per 100K | 0.04 | 0.04 | 0.4% |
Between the 2010 and 2020 Census, the number of Mastros bearers went from 130 to 120 (-7.7% change). The surname moved down 11,439 positions in the national ranking, going from #130,610 to #142,049.
FAQ
Mastros surname: questions and answers
How many people in the U.S. have the surname Mastros?
Name Census estimates that about 138 living Americans carry the surname Mastros. Using the current population baseline, that works out to roughly 1 in 2,483,727 residents.
How common is Mastros?
Mastros ranks #142,049 in the 2020 Census surname tables and is classified on this site as "Very Rare." The Census recorded the name at a frequency of 0.04 per 100,000 residents, which is about 0 people out of every 100,000.
How many people with this surname were counted in the Census?
The raw 2020 Census file counted 120 people with the surname Mastros. That is different from the site's living-bearer estimate (138), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 0.04 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 0.04 per 100,000 means that if you picked a random group of 100,000 U.S. residents, you would expect about 0 of them to have the surname Mastros.
Has Mastros become more or less common over time?
Between 2010 and 2020, the surname Mastros went from 130 recorded bearers to 120. That is a decrease of 10 (-7.7%). In the national ranking it fell from #130,610 to #142,049.
What does the Census say about the background of Mastros?
Among Census respondents with the surname Mastros, the largest self-reported group is White at 86.7%. The next largest groups are Hispanic (8.3%) and Two or More Races (2.5%). These figures come from the 2020 Census Bureau surname tables, based on how respondents described their own race and ethnicity.
Which group reports this surname most often?
White is the largest self-reported group for the surname Mastros in the 2020 Census, accounting for 86.7% (104 people in the source table).
What is the full ancestry breakdown?
Mastros appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (86.7%), Hispanic (8.3%), Two or More Races (2.5%). For 2020, the source file also published raw headcounts for each group, which is why this page can show both percentages and counts in the ancestry section.
Is this page using the latest Census data?
Yes. This page is using the latest surname file currently loaded on Name Census, which is 2020. The historical section above also keeps any older Census surname entries we have for Mastros (2000, 2010, 2020).
Does the Census include every surname?
No. The Census Bureau only publishes surnames that appeared at least 100 times in a given decennial Census. That means very rare surnames are excluded entirely, and a surname can appear in one Census release but disappear from a later one if it falls below the reporting threshold.
Why don't the ancestry percentages always add up to exactly 100%?
There are two main reasons: rounding and suppression. The Census Bureau rounds published values, and it may suppress very small cells to protect privacy. For 2020, the Bureau also published raw group counts rather than direct percentages, so Name Census converts those counts back into shares for comparability across census years.
What does Mastros mean?
A Greek occupational surname meaning "craftsman" or "master builder". The fuller origin note on this page goes into more detail.
Where does the surname data come from?
All surname statistics on Name Census are drawn from the US Census Bureau's decennial surname frequency tables. These files list every surname that appeared 100 or more times in the 2020 Census, along with a count, a per-100,000 rate, and a self-reported demographic breakdown. You can read the full explanation on our methodology page.
How does Name Census estimate living bearers?
For surnames, Name Census does not age cohorts the way it does for first names. Instead, it takes the Census Bureau's published frequency for Mastros (0.04 per 100,000) and applies that rate to the current U.S. resident population to estimate how many living Americans have the surname today.
How common is the surname Mastros?
Want to know how many people have the surname Mastros? HowManyOfMe.org, our sister site, puts the living-bearer count front and centre.