2010
#141,140
National surname rank
Recorded bearers 118
First available Census row
Per 100,000 0.04
Very Rare Last name
Giacomazza
A surname derived from the given name Giacomo, a variant of James or Jacob.
According to the 2020 US Census Bureau surname tables, roughly 136 Americans carry the last name Giacomazza. That puts it at #142,788 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,520,252 residents).
This page is the full Name Census profile for the Giacomazza 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
136
1 in 2,520,252
Census rank
#142,788
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
119
very rare in the US
Popularity narrative
The Census Bureau recorded 119 bearers of the surname Giacomazza in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 142788th position in the national surname ranking.
Among Census respondents with the surname Giacomazza, the largest self-reported group is White at 92.4%. The next largest groups are Hispanic (6.7%) and American Indian/Alaska Native (0.8%).
Origin
Meaning and origin of Giacomazza
The surname GIACOMAZZA has its origins in Italy, dating back to the late medieval period around the 13th century. It is believed to have originated in the regions of Tuscany and Umbria, where it was an occupational surname derived from the Italian word "giacca," meaning a jacket or coat.
The name likely referred to individuals who were skilled in the craft of making jackets or coats, perhaps tailors or clothiers. Over time, the surname evolved into various spellings, such as Giacomazza, Giacomazzi, and Giacomazzo.
Historical records indicate that the GIACOMAZZA surname appeared in several documents from the 14th and 15th centuries in central Italy. One notable example is the mention of a Ser Giacomazzo di Piero in a notarial record from the city of Siena, dated 1387.
The earliest recorded bearer of the GIACOMAZZA surname was Pietro Giacomazza, a merchant from Florence who lived in the mid-15th century. Another early figure was Niccolò Giacomazza, a renowned artist and painter from Perugia, who was active in the late 15th and early 16th centuries.
In the 16th century, the GIACOMAZZA family gained prominence in the city of Gubbio, located in the region of Umbria. One notable member was Girolamo Giacomazza, a respected jurist and legal scholar who served as a magistrate in Gubbio during the 1570s.
Another prominent figure was Vincenzo Giacomazza, a Florentine architect and engineer who lived in the late 16th and early 17th centuries. He was renowned for his work on several notable buildings, including the Palazzo Pitti in Florence.
During the 17th century, the GIACOMAZZA surname spread to other regions of Italy, particularly in the south. One notable bearer was Tommaso Giacomazza, a renowned physician and scholar from Naples, who authored several important medical treatises in the 1670s.
Throughout its history, the GIACOMAZZA surname has been associated with various professions, including artisans, merchants, legal professionals, and scholars, reflecting its origins as an occupational surname.
Demographics
Ancestry and ethnicity for Giacomazza
Among Census respondents with the surname Giacomazza, the largest self-reported group is White at 92.4%. The next largest groups are Hispanic (6.7%) and American Indian/Alaska Native (0.8%).
The bar chart below shows how Giacomazza 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 Giacomazza surname at the time of the 2020 Census, not any inherent property of the name itself.
- White92.4% · 110
- Hispanic or Latino6.7% · 8
- American Indian and Alaska Native0.8% · 1
Timeline
Historical Census data for Giacomazza
Giacomazza appears in 2 published Census surname files: 2010, 2020. The cards below show how the name's rank and bearer count changed across each release.
2020
#142,788
National surname rank
Recorded bearers 119
+1 bearers (+0.8%)
Per 100,000 0.04
Rank movement Down 1,648 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2010 | #141,140 | 118 | 0.04 | First available Census row | First available Census row |
| 2020 | #142,788 | 119 | 0.04 | +1 bearers (+0.8%) | Down 1,648 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 Giacomazza 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 | #141,140 | #142,788 | -1.2% |
| Count | 118 | 119 | 0.8% |
| Per 100K | 0.04 | 0.04 | -0.5% |
Between the 2010 and 2020 Census, the number of Giacomazza bearers went from 118 to 119 (+0.8% change). The surname moved down 1,648 positions in the national ranking, going from #141,140 to #142,788.
FAQ
Giacomazza surname: questions and answers
How many people in the U.S. have the surname Giacomazza?
Name Census estimates that about 136 living Americans carry the surname Giacomazza. Using the current population baseline, that works out to roughly 1 in 2,520,252 residents.
How common is Giacomazza?
Giacomazza ranks #142,788 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 119 people with the surname Giacomazza. That is different from the site's living-bearer estimate (136), 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 Giacomazza.
Has Giacomazza become more or less common over time?
Between 2010 and 2020, the surname Giacomazza went from 118 recorded bearers to 119. That is an increase of 1 (+0.8%). In the national ranking it fell from #141,140 to #142,788.
What does the Census say about the background of Giacomazza?
Among Census respondents with the surname Giacomazza, the largest self-reported group is White at 92.4%. The next largest groups are Hispanic (6.7%) and American Indian/Alaska Native (0.8%). 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 Giacomazza in the 2020 Census, accounting for 92.4% (110 people in the source table).
What is the full ancestry breakdown?
Giacomazza appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (92.4%), Hispanic (6.7%), American Indian/Alaska Native (0.8%). 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 Giacomazza (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 Giacomazza mean?
A surname derived from the given name Giacomo, a variant of James or Jacob. 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 Giacomazza (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 many people have the surname Giacomazza?
For a faster, more casual read, check HowManyOfMe.org — our sister site built around that single question.