Thaddius
Masculine · “A spelling of Thaddeus”
Thaddius is Thaddeus with an i, the name of an apostle that America has given to a handful of remarkable men. Two of them served the United States in wartime, one on its walls and one in its skies.
How old is the name Thaddius?
Thaddius first appears in US birth records in 1916 — 109 years ago. The typical Thaddius alive today was born around 1987, making them about 38 years old. About 500 people named Thaddius are estimated to be alive in the US today.
When was the name Thaddius most popular?
Thaddius peaked in 1972, reaching #2243 nationally. See the whole 1972 chart.
Lists built from the same records:
Where it comes from
From Thaddaios to Thaddius
The story of Thaddius
Tadeusz Kościuszko, a Polish military engineer, fortified Saratoga and West Point for the Continental Army; in his American will he asked Thomas Jefferson to use his money to free and educate enslaved people, Jefferson's own among them, and Jefferson never did. Thaddeus Lowe, chief of the Union Army's balloon corps, went up over Washington and telegraphed a message to President Lincoln from the air. Thaddius is one of the spellings American families have used.
Meaningscholars disagree
A spelling of Thaddeus, the apostle's name; its meaning is debated
Thaddeus may come from an Aramaic word for the chest or heart, or be a form of the Greek Theodotus, 'given by God'. Thaddius writes the ending with an i.
How the name formed
- Thaddaios
- Thaddeus
- Thaddius
Related forms: Tadeusz · Taddeo · Thaddeus
Pronouncing Thaddius
THAD-ee-us
Three syllables with the stress on the first.
Nicknames for Thaddius
Moderate
What the data says
146 years of official birth records
The long climb, and where it stands now
The same years in position rather than babies
- First recorded
- 1916
- Most boys named
- 198918 — the highest on record
- Peak rank
- #2243reached in 1972
- Change vs 2021
- −16.7%5 in 2023, from 6
Rank is a position, a count is a headcount, and they move independently — a name can hold its rank while the number of babies behind it falls. Source: U.S. Social Security Administration.
Thaddius in other languages
The same name elsewhere
- Tadeusz in Polish — same name
- Taddeo in Italian — same name
- Thaddeus in English — spelling variant
Thaddiuss among us
people named Thaddius are estimated to be alive in the US today
Estimated from SSA birth records and published actuarial life tables. Method
Is it right for you
Questions parents actually ask
Fashion outlook
Thaddius sits outside the current charts, and that is its own kind of answer: naming cycles can only date the names they carried up. A name this rare has no decade stamped on it — it cannot go out of fashion, because it was never in.
Based on 146 years of naming cycles. How we read them
The trade-off
- A distinguished name with real history.
- Comes with Thad and Tad as ready short forms.
- Rare, so a Thaddius is unlikely to meet another.
- Almost everyone will write Thaddeus.
- The i may be read as a slip.
- It is long for everyday use.
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Thaddius
Masculine
Frequently asked
- How many Thaddiuss are there in the world?
- No country counts the world's names, so there is no worldwide figure — anyone quoting one is estimating. About 500 people named Thaddius are estimated to be alive in the US today.
- How popular is the name Thaddius in 2025?
- Thaddius is rarely given in the US today — it does not rank in the top 2000 boy names.
- Will my child share the name Thaddius with classmates?
- Thaddius will almost certainly be the only one in school.
More T names
The most-given names starting with T, all years combined.
Thomas#34 · Timothy#203 · Tyler#219 · Terry#1115 · Theodore#4 · Travis#434 · Todd#1609 · Tony#783
Looking for what else is popular rather than what resembles Thaddius? See the current top 100.
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US figures from the Social Security Administration. 1880–2025. Data & methodology
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