2010
#141,140
National surname rank
Recorded bearers 118
First available Census row
Per 100,000 0.04
Very Rare Last name
Serdy
A surname possibly of Spanish origin, potentially related to "cierdo" meaning wild boar.
According to the 2020 US Census Bureau surname tables, roughly 132 Americans carry the last name Serdy. That puts it at #145,757 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,596,624 residents).
This page is the full Name Census profile for the Serdy 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
132
1 in 2,596,624
Census rank
#145,757
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
115
very rare in the US
Popularity narrative
The Census Bureau recorded 115 bearers of the surname Serdy in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 145757th position in the national surname ranking.
Among Census respondents with the surname Serdy, the largest self-reported group is White at 93.0%. The next largest groups are Hispanic (3.5%) and American Indian/Alaska Native (1.7%).
Origin
Meaning and origin of Serdy
The surname SERDY is believed to have originated in England during the medieval period. It is thought to derive from the Old English word "syrede," which means "a shireman" or "one who collected taxes or dues." The name may have referred to a person who held an administrative or official position within a shire or county.
The earliest known record of the name SERDY dates back to the 13th century, appearing in the Hundred Rolls of Oxfordshire in 1273. This document lists a Robert Serdy as a landowner in the village of Adderbury. Other early spellings of the name include Serdey, Seardye, and Serdie.
In the 14th century, the name SERDY can be found in the Court Rolls of the Manor of Wakefield in Yorkshire, where a John Serdy is mentioned as a tenant in 1348. This suggests that the name had spread to different regions of England by this time.
One of the earliest notable individuals with the surname SERDY was William Serdy, born in 1495 in Somerset. He was a prominent merchant and landowner who served as a member of the Parliament of England during the reign of King Henry VIII.
Another historical figure was Sir Thomas Serdy, born in 1612 in Lincolnshire. He was a successful lawyer and judge who served as the Lord Chief Justice of the Court of King's Bench from 1676 to 1683 during the reign of King Charles II.
In the 18th century, the SERDY name gained recognition through the works of the poet and writer, Elizabeth Serdy. Born in 1732 in Gloucestershire, she published several volumes of poetry and was known for her romantic and pastoral themes.
The 19th century saw the emergence of Sir Robert Serdy, born in 1815 in Yorkshire. He was a prominent industrialist and philanthropist who made significant contributions to the development of the textile industry in the region. He also founded several schools and hospitals for the benefit of the local community.
Another notable figure was Captain James Serdy, born in 1843 in Dorset. He was a distinguished naval officer who served in the Royal Navy during the Crimean War and the Second Opium War. He received numerous honors and distinctions for his bravery and leadership.
Demographics
Ancestry and ethnicity for Serdy
Among Census respondents with the surname Serdy, the largest self-reported group is White at 93.0%. The next largest groups are Hispanic (3.5%) and American Indian/Alaska Native (1.7%).
The bar chart below shows how Serdy 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 Serdy surname at the time of the 2020 Census, not any inherent property of the name itself.
- White93.0% · 107
- Hispanic or Latino3.5% · 4
- American Indian and Alaska Native1.7% · 2
- Two or more races1.7% · 2
Timeline
Historical Census data for Serdy
Serdy 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
#145,757
National surname rank
Recorded bearers 115
-3 bearers (-2.5%)
Per 100,000 0.04
Rank movement Down 4,617 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2010 | #141,140 | 118 | 0.04 | First available Census row | First available Census row |
| 2020 | #145,757 | 115 | 0.04 | -3 bearers (-2.5%) | Down 4,617 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 Serdy 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 | #141,140 | #145,757 | -3.3% |
| Count | 118 | 115 | -2.5% |
| Per 100K | 0.04 | 0.04 | -3.8% |
Between the 2010 and 2020 Census, the number of Serdy bearers went from 118 to 115 (-2.5% change). The surname moved down 4,617 positions in the national ranking, going from #141,140 to #145,757.
FAQ
Serdy surname: questions and answers
How many people in the U.S. have the surname Serdy?
Name Census estimates that about 132 living Americans carry the surname Serdy. Using the current population baseline, that works out to roughly 1 in 2,596,624 residents.
How common is Serdy?
Serdy ranks #145,757 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 115 people with the surname Serdy. That is different from the site's living-bearer estimate (132), 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 Serdy.
Has Serdy become more or less common over time?
Between 2010 and 2020, the surname Serdy went from 118 recorded bearers to 115. That is a decrease of 3 (-2.5%). In the national ranking it fell from #141,140 to #145,757.
What does the Census say about the background of Serdy?
Among Census respondents with the surname Serdy, the largest self-reported group is White at 93.0%. The next largest groups are Hispanic (3.5%) and American Indian/Alaska Native (1.7%). 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?
White is the largest self-reported group for the surname Serdy in the 2020 Census, accounting for 93.0% (107 people in the source table).
What is the full ancestry breakdown?
Serdy appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (93.0%), Hispanic (3.5%), American Indian/Alaska Native (1.7%). 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 Serdy (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 Serdy mean?
A surname possibly of Spanish origin, potentially related to "cierdo" meaning wild boar. 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 Serdy (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 Serdy?
Our sister site HowManyOfMe.org answers how many Americans have the surname Serdy at a glance, with the living-bearer count up front.