2000
#147,095
National surname rank
Recorded bearers 103
First available Census row
Per 100,000 0.04
Very Rare Last name
Giannos
A Greek surname derived from the given name Giannis, a form of John.
According to the 2020 US Census Bureau surname tables, roughly 124 Americans carry the last name Giannos. That puts it at #150,935 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,764,148 residents).
This page is the full Name Census profile for the Giannos 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
124
1 in 2,764,148
Census rank
#150,935
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
108
very rare in the US
Popularity narrative
The Census Bureau recorded 108 bearers of the surname Giannos in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 150935th position in the national surname ranking.
Among Census respondents with the surname Giannos, the largest self-reported group is White at 94.4%. The next largest groups are Hispanic (5.6%).
Origin
Meaning and origin of Giannos
The surname Giannos originates from Greece and can be traced back to the Byzantine era, around the 4th century AD. It is derived from the Greek name Ioannes, which is the equivalent of the English name John. The name Ioannes itself has roots in the Hebrew name Yohanan, meaning "Graced by God."
Giannos was initially a patronymic surname, indicating that the bearer was the son or descendant of Ioannes. In ancient records, the name often appeared as Giannos or Giannou, reflecting the Greek grammatical cases used for surnames at the time.
One of the earliest known references to the surname Giannos can be found in the Codex Theodosianus, a collection of imperial decrees compiled in the 5th century AD. This document mentions a "Giannos of Thessaloniki," suggesting that the name was present in the region of modern-day Greece during the Byzantine period.
In the 11th century, a renowned scholar and philosopher named Michael Giannos was active in Constantinople, the capital of the Byzantine Empire. He is known for his work on Greek philosophy and his teachings at the University of Constantinople.
During the 13th century, a notable figure bearing the surname Giannos was Theodoros Giannos, a Greek Orthodox monk and theologian from the island of Crete. He was renowned for his writings on monastic life and his contributions to the spiritual literature of the time.
In the 15th century, a Greek physician named Giorgios Giannos gained fame for his medical treatises and his work in advancing the study of anatomy and physiology. He practiced in various cities across the Ottoman Empire and was highly regarded for his expertise.
Another prominent individual with the surname Giannos was Konstantinos Giannos, a Greek revolutionary who lived in the 18th century. He played a significant role in the Greek War of Independence against the Ottoman Empire and was recognized for his leadership and bravery on the battlefield.
Throughout history, the surname Giannos has been closely associated with the Greek culture and has maintained a strong presence in regions with a significant Greek population, such as Greece, Cyprus, and areas of the former Byzantine Empire.
Demographics
Ancestry and ethnicity for Giannos
Among Census respondents with the surname Giannos, the largest self-reported group is White at 94.4%. The next largest groups are Hispanic (5.6%).
The bar chart below shows how Giannos 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 Giannos surname at the time of the 2020 Census, not any inherent property of the name itself.
- White94.4% · 102
- Hispanic or Latino5.6% · 6
Timeline
Historical Census data for Giannos
Giannos 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
#145,220
National surname rank
Recorded bearers 114
+11 bearers (+10.7%)
Per 100,000 0.04
Rank movement Up 1,875 places
2020
#150,935
National surname rank
Recorded bearers 108
-6 bearers (-5.3%)
Per 100,000 0.04
Rank movement Down 5,715 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 | #145,220 | 114 | 0.04 | +11 bearers (+10.7%) | Up 1,875 places |
| 2020 | #150,935 | 108 | 0.04 | -6 bearers (-5.3%) | Down 5,715 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 Giannos 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 | #145,220 | #150,935 | -3.9% |
| Count | 114 | 108 | -5.3% |
| Per 100K | 0.04 | 0.04 | -9.7% |
Between the 2010 and 2020 Census, the number of Giannos bearers went from 114 to 108 (-5.3% change). The surname moved down 5,715 positions in the national ranking, going from #145,220 to #150,935.
FAQ
Giannos surname: questions and answers
How many people in the U.S. have the surname Giannos?
Name Census estimates that about 124 living Americans carry the surname Giannos. Using the current population baseline, that works out to roughly 1 in 2,764,148 residents.
How common is Giannos?
Giannos ranks #150,935 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 108 people with the surname Giannos. That is different from the site's living-bearer estimate (124), 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 Giannos.
Has Giannos become more or less common over time?
Between 2010 and 2020, the surname Giannos went from 114 recorded bearers to 108. That is a decrease of 6 (-5.3%). In the national ranking it fell from #145,220 to #150,935.
What does the Census say about the background of Giannos?
Among Census respondents with the surname Giannos, the largest self-reported group is White at 94.4%. The next largest groups are Hispanic (5.6%). 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 Giannos in the 2020 Census, accounting for 94.4% (102 people in the source table).
What is the full ancestry breakdown?
Giannos appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (94.4%), Hispanic (5.6%). 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 Giannos (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 Giannos mean?
A Greek surname derived from the given name Giannis, a form of John. 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 Giannos (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 Giannos?
Find out how common the surname Giannos is on our sister site HowManyOfMe.org — a quick modern estimate with the living-bearer count front and centre.