2010
#133,048
National surname rank
Recorded bearers 127
First available Census row
Per 100,000 0.04
Very Rare Last name
Diaconescu
A Romanian surname derived from the word "diacon" meaning deacon or cleric.
According to the 2020 US Census Bureau surname tables, roughly 128 Americans carry the last name Diaconescu. That puts it at #147,954 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,677,768 residents).
This page is the full Name Census profile for the Diaconescu 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
128
1 in 2,677,768
Census rank
#147,954
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
112
very rare in the US
Popularity narrative
The Census Bureau recorded 112 bearers of the surname Diaconescu in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 147954th position in the national surname ranking.
Among Census respondents with the surname Diaconescu, the largest self-reported group is White at 92.9%. The next largest groups are Hispanic (3.6%) and Asian/Pacific Islander (1.8%).
Origin
Meaning and origin of Diaconescu
The surname Diaconescu originated in Romania, deriving from the Romanian word "diacon," which means "deacon." This name first appeared in the historical region of Wallachia, located in the southern part of the country, during the 16th century.
The earliest recorded instances of the name Diaconescu can be found in church records and official documents from the principalities of Wallachia and Moldavia, which were part of the Ottoman Empire at the time. It is believed that the name was initially given to individuals who served as deacons or assistants to priests in the Eastern Orthodox Church.
One of the notable historical figures bearing the surname Diaconescu was Gheorghe Diaconescu (1808-1876), a prominent Romanian politician and writer who played a significant role in the movement for Romanian national awakening and independence from Ottoman rule in the 19th century.
Another remarkable individual with this surname was Alexandru Diaconescu (1877-1953), a renowned Romanian mathematician and educator. He contributed significantly to the development of mathematics education in Romania and authored several influential textbooks.
In the 20th century, Ion Diaconescu (1917-2011) was a prominent Romanian ethnographer and folklorist who dedicated his life to preserving and documenting the cultural traditions and customs of the Romanian people.
The name Diaconescu can also be traced back to various place names in Romania, such as the village of Diaconeşti in the county of Bacău, which was likely named after an early settler or landowner with the surname.
It is worth noting that the spelling of the name has remained relatively consistent over time, with only minor variations appearing in historical records due to regional dialects or scribal errors.
While the surname Diaconescu is predominantly found in Romania, it has also spread to other parts of the world through emigration, particularly to countries with significant Romanian diaspora communities.
Demographics
Ancestry and ethnicity for Diaconescu
Among Census respondents with the surname Diaconescu, the largest self-reported group is White at 92.9%. The next largest groups are Hispanic (3.6%) and Asian/Pacific Islander (1.8%).
The bar chart below shows how Diaconescu 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 Diaconescu surname at the time of the 2020 Census, not any inherent property of the name itself.
- White92.9% · 104
- Hispanic or Latino3.6% · 4
- Asian and Pacific Islander1.8% · 2
- Two or more races1.8% · 2
Timeline
Historical Census data for Diaconescu
Diaconescu 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
#147,954
National surname rank
Recorded bearers 112
-15 bearers (-11.8%)
Per 100,000 0.04
Rank movement Down 14,906 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2010 | #133,048 | 127 | 0.04 | First available Census row | First available Census row |
| 2020 | #147,954 | 112 | 0.04 | -15 bearers (-11.8%) | Down 14,906 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 Diaconescu 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 | #133,048 | #147,954 | -11.2% |
| Count | 127 | 112 | -11.8% |
| Per 100K | 0.04 | 0.04 | -6.3% |
Between the 2010 and 2020 Census, the number of Diaconescu bearers went from 127 to 112 (-11.8% change). The surname moved down 14,906 positions in the national ranking, going from #133,048 to #147,954.
FAQ
Diaconescu surname: questions and answers
How many people in the U.S. have the surname Diaconescu?
Name Census estimates that about 128 living Americans carry the surname Diaconescu. Using the current population baseline, that works out to roughly 1 in 2,677,768 residents.
How common is Diaconescu?
Diaconescu ranks #147,954 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 112 people with the surname Diaconescu. That is different from the site's living-bearer estimate (128), 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 Diaconescu.
Has Diaconescu become more or less common over time?
Between 2010 and 2020, the surname Diaconescu went from 127 recorded bearers to 112. That is a decrease of 15 (-11.8%). In the national ranking it fell from #133,048 to #147,954.
What does the Census say about the background of Diaconescu?
Among Census respondents with the surname Diaconescu, the largest self-reported group is White at 92.9%. The next largest groups are Hispanic (3.6%) and Asian/Pacific Islander (1.8%). 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 Diaconescu in the 2020 Census, accounting for 92.9% (104 people in the source table).
What is the full ancestry breakdown?
Diaconescu appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (92.9%), Hispanic (3.6%), Asian/Pacific Islander (1.8%). 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 Diaconescu (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 Diaconescu mean?
A Romanian surname derived from the word "diacon" meaning deacon or cleric. 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 Diaconescu (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 share the surname Diaconescu?
HowManyOfMe.org, our sister site, answers that with the living-bearer count in one glance.