2010
#142,108
National surname rank
Recorded bearers 117
First available Census row
Per 100,000 0.04
Very Rare Last name
Cydrus
A habitational surname denoting someone from a place named Cydrus or Cidrus.
According to the 2020 US Census Bureau surname tables, roughly 130 Americans carry the last name Cydrus. That puts it at #147,221 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,636,572 residents).
This page is the full Name Census profile for the Cydrus 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
130
1 in 2,636,572
Census rank
#147,221
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
113
very rare in the US
Popularity narrative
The Census Bureau recorded 113 bearers of the surname Cydrus in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 147221st position in the national surname ranking.
Among Census respondents with the surname Cydrus, the largest self-reported group is White at 95.6%. The next largest groups are Two or More Races (3.5%) and Hispanic (0.9%).
Origin
Meaning and origin of Cydrus
The surname CYDRUS has its origins in ancient Greece, dating back to the 5th century BCE. It is believed to be derived from the Greek word "kydros," which means "glorious" or "distinguished." This name was likely given to individuals who had achieved a high level of renown or status in their communities.
One of the earliest recorded instances of the name CYDRUS can be found in the writings of the Greek historian Herodotus, who mentions a man by that name serving as a military commander during the Greco-Persian Wars. Unfortunately, no further details are provided about this individual's life or accomplishments.
During the Byzantine Empire, the name CYDRUS was occasionally used among the Greek nobility and aristocracy. In the 11th century, a document from the imperial archives mentions a nobleman named Alexios CYDRUS, who was granted lands in Asia Minor for his loyal service to the emperor.
In the 13th century, a renowned scholar and philosopher named Georgios CYDRUS was born in the city of Constantinople. He was known for his extensive knowledge of classical literature and his contributions to the fields of logic and metaphysics. Unfortunately, much of his work has been lost to history.
In the late 15th century, a Greek merchant named Demetrios CYDRUS settled in Venice, where he established a successful trading company. His descendants continued to use the surname, and some of them later migrated to other parts of Europe, helping to spread the name beyond its Greek origins.
Another notable figure who bore the surname CYDRUS was Ioannis CYDRUS, a Greek painter from the island of Crete who lived in the 17th century. He was renowned for his religious iconography and his mastery of the Byzantine artistic tradition. Several of his works can still be found in churches and museums throughout Greece and the Mediterranean region.
While the surname CYDRUS is relatively uncommon in modern times, it has a rich historical legacy that spans centuries and reflects the cultural influence of ancient Greece and the Byzantine Empire. The name's meaning and association with glory and distinction serve as a reminder of the accomplishments and contributions of those who bore it throughout history.
Demographics
Ancestry and ethnicity for Cydrus
Among Census respondents with the surname Cydrus, the largest self-reported group is White at 95.6%. The next largest groups are Two or More Races (3.5%) and Hispanic (0.9%).
The bar chart below shows how Cydrus 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 Cydrus surname at the time of the 2020 Census, not any inherent property of the name itself.
- White95.6% · 108
- Two or more races3.5% · 4
- Hispanic or Latino0.9% · 1
Timeline
Historical Census data for Cydrus
Cydrus 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
#147,221
National surname rank
Recorded bearers 113
-4 bearers (-3.4%)
Per 100,000 0.04
Rank movement Down 5,113 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2010 | #142,108 | 117 | 0.04 | First available Census row | First available Census row |
| 2020 | #147,221 | 113 | 0.04 | -4 bearers (-3.4%) | Down 5,113 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 Cydrus 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 | #142,108 | #147,221 | -3.6% |
| Count | 117 | 113 | -3.4% |
| Per 100K | 0.04 | 0.04 | -5.5% |
Between the 2010 and 2020 Census, the number of Cydrus bearers went from 117 to 113 (-3.4% change). The surname moved down 5,113 positions in the national ranking, going from #142,108 to #147,221.
FAQ
Cydrus surname: questions and answers
How many people in the U.S. have the surname Cydrus?
Name Census estimates that about 130 living Americans carry the surname Cydrus. Using the current population baseline, that works out to roughly 1 in 2,636,572 residents.
How common is Cydrus?
Cydrus ranks #147,221 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 113 people with the surname Cydrus. That is different from the site's living-bearer estimate (130), 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 Cydrus.
Has Cydrus become more or less common over time?
Between 2010 and 2020, the surname Cydrus went from 117 recorded bearers to 113. That is a decrease of 4 (-3.4%). In the national ranking it fell from #142,108 to #147,221.
What does the Census say about the background of Cydrus?
Among Census respondents with the surname Cydrus, the largest self-reported group is White at 95.6%. The next largest groups are Two or More Races (3.5%) and Hispanic (0.9%). 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 Cydrus in the 2020 Census, accounting for 95.6% (108 people in the source table).
What is the full ancestry breakdown?
Cydrus appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (95.6%), Two or More Races (3.5%), Hispanic (0.9%). 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 Cydrus (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 Cydrus mean?
A habitational surname denoting someone from a place named Cydrus or Cidrus. 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 Cydrus (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 Cydrus?
HowManyOfMe.org, our sister site, answers that with the living-bearer count in one glance.