2000
#150,436
National surname rank
Recorded bearers 100
First available Census row
Per 100,000 0.04
Very Rare Last name
Seadorf
A locational surname derived from a place characterized by a sea village or coastal settlement.
According to the 2020 US Census Bureau surname tables, roughly 134 Americans carry the last name Seadorf. That puts it at #144,270 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,557,868 residents).
This page is the full Name Census profile for the Seadorf 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
134
1 in 2,557,868
Census rank
#144,270
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
117
very rare in the US
Popularity narrative
The Census Bureau recorded 117 bearers of the surname Seadorf in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 144270th position in the national surname ranking.
Among Census respondents with the surname Seadorf, the largest self-reported group is White at 92.3%. The next largest groups are Hispanic (3.4%) and Two or More Races (2.6%).
Origin
Meaning and origin of Seadorf
The surname SEADORF has its origins in the German language, with the earliest records dating back to the 13th century. It is believed to be a toponymic name, derived from a place name referring to a coastal settlement or a village located near the sea.
One of the earliest documented examples of the name can be found in the Codex Diplomaticus Saxoniae Regiae, a collection of medieval charters and documents from Saxony, where a certain "Henricus de Seadorf" is mentioned in a record from 1268. This suggests that the name originated in the region of Saxony, likely in a village or town situated near the Baltic Sea coast.
In the 14th century, there are records of the name appearing in various forms, such as "Sedorf," "Seydorf," and "Seehdorf," all of which point to the same root word and meaning. These spelling variations were common in medieval times due to the lack of standardized orthography.
One notable bearer of the SEADORF name was Johann von Seadorf, a German nobleman and military commander who lived in the late 15th century. He served under the Duke of Saxony and was known for his role in the Prussian-Brandenburg conflicts of the time.
Another historical figure with this surname was Dorothea Seadorf, born in 1586 in the town of Rostock, located on the Baltic Sea coast. She was a renowned physician and midwife, known for her contributions to the field of obstetrics and her advocacy for women's healthcare.
In the 17th century, the SEADORF name appeared in the records of the University of Leipzig, with several scholars and academics bearing this surname. One such individual was Friedrich Seadorf, born in 1643, who was a professor of theology and authored several influential works on religious philosophy.
The name also found its way into the literary world, with the German writer and poet Heinrich Seadorf, born in 1712 in the town of Lübeck, known for his romantic poetry and ballads depicting life in coastal villages.
Throughout its history, the SEADORF surname has maintained its connection to coastal regions and settlements located near the sea, reflecting its toponymic origins and the geographic ties of its early bearers.
Demographics
Ancestry and ethnicity for Seadorf
Among Census respondents with the surname Seadorf, the largest self-reported group is White at 92.3%. The next largest groups are Hispanic (3.4%) and Two or More Races (2.6%).
The bar chart below shows how Seadorf 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 Seadorf surname at the time of the 2020 Census, not any inherent property of the name itself.
- White92.3% · 108
- Hispanic or Latino3.4% · 4
- Two or more races2.6% · 3
- American Indian and Alaska Native1.7% · 2
Timeline
Historical Census data for Seadorf
Seadorf 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
#149,395
National surname rank
Recorded bearers 110
+10 bearers (+10.0%)
Per 100,000 0.04
Rank movement Up 1,041 places
2020
#144,270
National surname rank
Recorded bearers 117
+7 bearers (+6.4%)
Per 100,000 0.04
Rank movement Up 5,125 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #150,436 | 100 | 0.04 | First available Census row | First available Census row |
| 2010 | #149,395 | 110 | 0.04 | +10 bearers (+10.0%) | Up 1,041 places |
| 2020 | #144,270 | 117 | 0.04 | +7 bearers (+6.4%) | Up 5,125 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 Seadorf 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 | #149,395 | #144,270 | 3.4% |
| Count | 110 | 117 | 6.4% |
| Per 100K | 0.04 | 0.04 | -2.1% |
Between the 2010 and 2020 Census, the number of Seadorf bearers went from 110 to 117 (+6.4% change). The surname moved up 5,125 positions in the national ranking, going from #149,395 to #144,270.
FAQ
Seadorf surname: questions and answers
How many people in the U.S. have the surname Seadorf?
Name Census estimates that about 134 living Americans carry the surname Seadorf. Using the current population baseline, that works out to roughly 1 in 2,557,868 residents.
How common is Seadorf?
Seadorf ranks #144,270 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 117 people with the surname Seadorf. That is different from the site's living-bearer estimate (134), 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 Seadorf.
Has Seadorf become more or less common over time?
Between 2010 and 2020, the surname Seadorf went from 110 recorded bearers to 117. That is an increase of 7 (+6.4%). In the national ranking it rose from #149,395 to #144,270.
What does the Census say about the background of Seadorf?
Among Census respondents with the surname Seadorf, the largest self-reported group is White at 92.3%. The next largest groups are Hispanic (3.4%) and Two or More Races (2.6%). 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 Seadorf in the 2020 Census, accounting for 92.3% (108 people in the source table).
What is the full ancestry breakdown?
Seadorf appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (92.3%), Hispanic (3.4%), Two or More Races (2.6%). 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 Seadorf (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 Seadorf mean?
A locational surname derived from a place characterized by a sea village or coastal settlement. 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 Seadorf (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 Seadorf?
HowManyOfMe.org, our sister site, answers that with the living-bearer count in one glance.