2000
#147,095
National surname rank
Recorded bearers 103
First available Census row
Per 100,000 0.04
Very Rare Last name
Deldeo
A surname of Italian origin referring to either a person from Dell'Deo or a devotee of God.
According to the 2020 US Census Bureau surname tables, roughly 122 Americans carry the last name Deldeo. That puts it at #152,339 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,809,462 residents).
This page is the full Name Census profile for the Deldeo 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
122
1 in 2,809,462
Census rank
#152,339
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
106
very rare in the US
Popularity narrative
The Census Bureau recorded 106 bearers of the surname Deldeo in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 152339th position in the national surname ranking.
Among Census respondents with the surname Deldeo, the largest self-reported group is White at 90.6%. The next largest groups are Two or More Races (5.7%) and American Indian/Alaska Native (1.9%).
Origin
Meaning and origin of Deldeo
The surname DELDEO is believed to have originated in the Italian region of Tuscany, specifically in the province of Siena, during the 13th century. It is thought to be derived from the Latin phrase "de Dei dono," which translates to "from God's gift," suggesting a possible connection to a religious order or a family that received a divine blessing.
One of the earliest recorded instances of this surname can be found in a document from the year 1275, where a certain Guido Deldeo is mentioned as a landowner in the town of Montepulciano. This town, located in the heart of Tuscany, was renowned for its wine production, which may have contributed to the family's prosperity.
In the 14th century, the Deldeo family gained prominence in the city of Siena, with several members holding significant positions within the local government and the Church. A noteworthy figure from this era was Bartolomeo Deldeo, a prominent merchant and banker who lived between 1320 and 1395. He played a crucial role in the economic development of Siena during the Renaissance period.
As the Deldeo family expanded and migrated to other parts of Italy, the name underwent minor variations in spelling, such as Deldio, Deldei, and Deldeio. These variations were often influenced by regional dialects and local scribes' interpretations.
During the 16th century, a branch of the Deldeo family settled in the city of Naples, where they became known for their contribution to the arts and literature. One notable figure from this time was Gian Battista Deldeo, a celebrated poet born in 1525, whose works were widely acclaimed throughout Italy.
In the 17th century, the Deldeo name appears in historical records from the Papal States, particularly in the city of Rome. Francesco Deldeo, born in 1645, was a renowned architect and sculptor who worked on several notable projects, including the restoration of the Trevi Fountain.
As the centuries passed, the Deldeo surname continued to be carried by individuals from various walks of life, including scholars, artists, and military officials. One such figure was Antonio Deldeo, a highly regarded military strategist who lived from 1780 to 1857 and played a significant role in the Napoleonic Wars.
While the name DELDEO may have originated in Italy, it has since spread to other parts of the world, carried by descendants of the original Italian families. However, its rich historical roots and connections to the Italian Renaissance and cultural heritage remain an integral part of its legacy.
Demographics
Ancestry and ethnicity for Deldeo
Among Census respondents with the surname Deldeo, the largest self-reported group is White at 90.6%. The next largest groups are Two or More Races (5.7%) and American Indian/Alaska Native (1.9%).
The bar chart below shows how Deldeo 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 Deldeo surname at the time of the 2020 Census, not any inherent property of the name itself.
- White90.6% · 96
- Two or more races5.7% · 6
- American Indian and Alaska Native1.9% · 2
- Black or African American0.9% · 1
- Asian and Pacific Islander0.9% · 1
Timeline
Historical Census data for Deldeo
Deldeo 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
#148,347
National surname rank
Recorded bearers 111
+8 bearers (+7.8%)
Per 100,000 0.04
Rank movement Down 1,252 places
2020
#152,339
National surname rank
Recorded bearers 106
-5 bearers (-4.5%)
Per 100,000 0.04
Rank movement Down 3,992 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #147,095 | 103 | 0.04 | First available Census row | First available Census row |
| 2010 | #148,347 | 111 | 0.04 | +8 bearers (+7.8%) | Down 1,252 places |
| 2020 | #152,339 | 106 | 0.04 | -5 bearers (-4.5%) | Down 3,992 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 Deldeo 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 | #148,347 | #152,339 | -2.7% |
| Count | 111 | 106 | -4.5% |
| Per 100K | 0.04 | 0.04 | -11.3% |
Between the 2010 and 2020 Census, the number of Deldeo bearers went from 111 to 106 (-4.5% change). The surname moved down 3,992 positions in the national ranking, going from #148,347 to #152,339.
FAQ
Deldeo surname: questions and answers
How many people in the U.S. have the surname Deldeo?
Name Census estimates that about 122 living Americans carry the surname Deldeo. Using the current population baseline, that works out to roughly 1 in 2,809,462 residents.
How common is Deldeo?
Deldeo ranks #152,339 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 106 people with the surname Deldeo. That is different from the site's living-bearer estimate (122), 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 Deldeo.
Has Deldeo become more or less common over time?
Between 2010 and 2020, the surname Deldeo went from 111 recorded bearers to 106. That is a decrease of 5 (-4.5%). In the national ranking it fell from #148,347 to #152,339.
What does the Census say about the background of Deldeo?
Among Census respondents with the surname Deldeo, the largest self-reported group is White at 90.6%. The next largest groups are Two or More Races (5.7%) and American Indian/Alaska Native (1.9%). 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 Deldeo in the 2020 Census, accounting for 90.6% (96 people in the source table).
What is the full ancestry breakdown?
Deldeo appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (90.6%), Two or More Races (5.7%), American Indian/Alaska Native (1.9%). 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 Deldeo (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 Deldeo mean?
A surname of Italian origin referring to either a person from Dell'Deo or a devotee of God. 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 Deldeo (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 last name Deldeo?
For a quick modern take, check how common the surname Deldeo is on our sister site HowManyOfMe.org.