2000
#146,011
National surname rank
Recorded bearers 104
First available Census row
Per 100,000 0.04
Very Rare Last name
Diah
A surname likely of Kazakh ethnicity or origin.
According to the 2020 US Census Bureau surname tables, roughly 136 Americans carry the last name Diah. 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 Diah 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 Diah 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 Diah, the largest self-reported group is Black at 77.3%. The next largest groups are Asian/Pacific Islander (10.1%) and Two or More Races (6.7%).
Origin
Meaning and origin of Diah
The surname Diah has its origins in the Indian subcontinent, specifically in the Tamil-speaking regions of southern India. It is believed to have emerged during the medieval period, around the 11th or 12th century CE.
The name Diah is thought to be derived from the Tamil word "thiaagam," which means "sacrifice" or "renunciation." This suggests that the surname may have been initially bestowed upon individuals or families who were known for their sacrificial or ascetic way of life, possibly associated with religious or spiritual practices.
One of the earliest recorded instances of the surname Diah can be found in ancient Tamil literature, such as the Purananuru, a collection of poems dating back to the Sangam period (c. 300 BCE – 300 CE). The name appears in reference to certain individuals, although the specific details remain obscure due to the age of the texts.
During the reign of the Chola Empire, which ruled over large parts of southern India from the 9th to the 13th century CE, the name Diah is mentioned in several inscriptions and copper plate grants issued by the Chola monarchs. These records often listed individuals bearing the surname, indicating their association with various administrative or religious roles within the empire.
One notable figure from history who bore the surname Diah was Arunagiri Diah, a Tamil scholar and poet who lived in the 15th century CE. He is renowned for his contributions to Tamil literature and his works on Hindu philosophy and spirituality.
Another individual of historical significance was Krishnama Diah, a prominent military commander who served under the Vijayanagar Empire in the 16th century CE. He played a crucial role in several battles against the Deccan Sultanates and is recorded in contemporary accounts for his strategic prowess and leadership on the battlefield.
In the 17th century, a religious figure named Raghavendra Diah gained recognition as a revered saint and philosopher in the Dvaita tradition of Hinduism. He authored several influential works and established monasteries in various parts of southern India, attracting a large following of devotees.
During the colonial era, the surname Diah continued to be found in records and documents compiled by British administrators and researchers studying the region's history and culture. One notable individual from this period was Saravana Diah, a scholar and linguist who collaborated with Western academics in translating and preserving ancient Tamil literary works.
While the surname Diah may have originated in southern India, it has since spread to other parts of the subcontinent and beyond, carried by individuals and families who migrated or were part of the Tamil diaspora. However, its roots and historical significance remain deeply intertwined with the cultural and linguistic heritage of the Tamil people.
Demographics
Ancestry and ethnicity for Diah
Among Census respondents with the surname Diah, the largest self-reported group is Black at 77.3%. The next largest groups are Asian/Pacific Islander (10.1%) and Two or More Races (6.7%).
The bar chart below shows how Diah 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 Diah surname at the time of the 2020 Census, not any inherent property of the name itself.
- Black or African American77.3% · 92
- Asian and Pacific Islander10.1% · 12
- Two or more races6.7% · 8
- White2.5% · 3
- Hispanic or Latino2.5% · 3
- American Indian and Alaska Native0.8% · 1
Timeline
Historical Census data for Diah
Diah 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
#146,201
National surname rank
Recorded bearers 113
+9 bearers (+8.7%)
Per 100,000 0.04
Rank movement Down 190 places
2020
#142,788
National surname rank
Recorded bearers 119
+6 bearers (+5.3%)
Per 100,000 0.04
Rank movement Up 3,413 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #146,011 | 104 | 0.04 | First available Census row | First available Census row |
| 2010 | #146,201 | 113 | 0.04 | +9 bearers (+8.7%) | Down 190 places |
| 2020 | #142,788 | 119 | 0.04 | +6 bearers (+5.3%) | Up 3,413 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 Diah 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 | #146,201 | #142,788 | 2.3% |
| Count | 113 | 119 | 5.3% |
| Per 100K | 0.04 | 0.04 | -0.5% |
Between the 2010 and 2020 Census, the number of Diah bearers went from 113 to 119 (+5.3% change). The surname moved up 3,413 positions in the national ranking, going from #146,201 to #142,788.
FAQ
Diah surname: questions and answers
How many people in the U.S. have the surname Diah?
Name Census estimates that about 136 living Americans carry the surname Diah. Using the current population baseline, that works out to roughly 1 in 2,520,252 residents.
How common is Diah?
Diah 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 Diah. 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 Diah.
Has Diah become more or less common over time?
Between 2010 and 2020, the surname Diah went from 113 recorded bearers to 119. That is an increase of 6 (+5.3%). In the national ranking it rose from #146,201 to #142,788.
What does the Census say about the background of Diah?
Among Census respondents with the surname Diah, the largest self-reported group is Black at 77.3%. The next largest groups are Asian/Pacific Islander (10.1%) and Two or More Races (6.7%). 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?
Black is the largest self-reported group for the surname Diah in the 2020 Census, accounting for 77.3% (92 people in the source table).
What is the full ancestry breakdown?
Diah appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are Black (77.3%), Asian/Pacific Islander (10.1%), Two or More Races (6.7%). 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 Diah (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 Diah mean?
A surname likely of Kazakh ethnicity or origin. 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 Diah (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 Americans have the surname Diah?
HowManyOfMe.org, our sister site, answers that with the living-bearer count in one glance.