Thadius
Masculine · “heart”
Thadius is Thaddeus written with one d and the Latin-looking -ius ending of Julius and Darius. It is said the same as Thaddeus and has no separate history; Thaddeus is the apostle whom tradition identifies with Jude.
How old is the name Thadius?
Thadius first appears in US birth records in 1922 — 103 years ago. The typical Thadius alive today was born around 1991, making them about 34 years old. About 500 people named Thadius are estimated to be alive in the US today.
When was the name Thadius most popular?
Thadius peaked in 1974, reaching #2199 nationally. See the whole 1974 chart.
Lists built from the same records:
Where it comes from
From Aramaic Taddai to Thadius
The story of Thadius
Thaddeus appears in the lists of the twelve apostles in Matthew and Mark, where Luke names Judas son of James instead, and tradition has treated the two as one man, Jude Thaddeus. English-speaking Protestants kept the name in use, and it came to America early. Thadius writes it with a single d and the -ius of Latin names, a change the ear does not hear.
Meaningscholars disagree
heart, or given by God
Thaddeus is contested. One reading takes it from an Aramaic word for 'breast' or 'heart'; another treats it as an Aramaic short form of a Greek name such as Theodotos, 'given by God'. Thadius adds no meaning of its own.
How the name formed
- Aramaic Taddai
- Greek Thaddaios
- Latin Thaddaeus
- Thaddeus
- Thadius
Pronouncing Thadius
THAD-ee-us
Said exactly like Thaddeus.
Nicknames for Thadius
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
- 1922
- Most boys named
- 197419 — the highest on record
- Peak rank
- #2199reached in 1974
- Change vs 2020
- +40.0%7 in 2024, from 5
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.
Thadiuss among us
people named Thadius 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
Thadius 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
- Said exactly like Thaddeus, a name with a long biblical and American history.
- Thad and Tad are ready as short forms.
- Its -ius ending looks at home beside Julius and Darius.
- Most people will write Thaddeus, and forms will correct it; expect to spell out the single d and the -ius.
- Anyone who knows the standard form may read it as a misspelling; Thad, spelled the same either way, makes daily life simple.
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Thadius
Masculine
Frequently asked
- How many Thadiuss 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 Thadius are estimated to be alive in the US today.
- How popular is the name Thadius in 2025?
- Thadius is rarely given in the US today — it does not rank in the top 2000 boy names.
- Will my child share the name Thadius with classmates?
- Thadius 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 Thadius? See the current top 100.
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US figures from the Social Security Administration. 1880–2025. Data & methodology
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