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Home › Baby Names Directory › Thaddius

Thaddius

♂ Boy

How to Pronounce Thaddius

Pronounced THAD-ee-us /ˈθæd.i.əs/Medium

Meaning: Thaddius is a spelling variant of Thaddeus, from the Greek Thaddaios, itself the Greek form of the Aramaic Taddai, possibly derived from an Aramaic word for 'heart, breast'; the name belonged to one of the twelve apostles in the Gospel of Matthew.Low

In 30 seconds: Thaddius spells out Thaddeus, an apostle's name possibly meaning 'heart' in Aramaic. It had a long, quiet run, peaking around 1989 (said THAD-ee-us).
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Origin MediumAramaic, Greek
MeaningThaddius is a spelling variant of Thaddeus, from the Greek Thaddaios, itself the Greek form of the Aramaic Taddai, possibly derived from an Aramaic word for 'heart, breast'; the name belonged to one of the twelve apostles in the Gospel of Matthew.
U.S. rank (2023)#13965 ↘ Falling
2023 U.S. births5 boys (0.00% of U.S. boys)
Peak year1989
Total births (all-time)≈ 593

Popularity in the U.S. · SSA data

peak 198919162023

U.S. births per year (Social Security Administration, 1880–present). Pink marker = peak year.

SSA data updated May 2026. How we source & verify this data.

History & Origin

Thaddius respells Thaddeus, the Greek form of the Aramaic Taddai, possibly meaning 'heart.' The apostle Thaddaeus is named in the Gospel of Matthew, though elsewhere in the New Testament the apostle Jude appears in his place, and scholars believe the two names may refer to the same person.

Thaddius has appeared steadily in United States records for decades, given to about eighteen boys a year at its peak around 1989 and continuing into the 2020s. It reads today as a distinctive, slightly formal biblical name.

Did you know? Thaddius carries the name of one of the twelve apostles, Thaddaeus, whose own root is debated by scholars: it may mean 'heart' in Aramaic or simply be an Aramaic form of the Greek Theodore.
Overall data confidence 55%
Behind the Name - Thaddeus — Greek Thaddaios, Aramaic Taddai, possibly 'heart'; New Testament apostle

Variations

ThaddeusThadeusTadeusz

Nicknames

ThadTeddy

Famous Bearers

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If you like Thaddius…

Thaddeus— the standard spelling it varies
Tadeusz— the Polish form of the same apostolic name
Jude— the apostle whose name may refer to the same person
Theodore— a possible related Greek root by some scholarly readings

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Frequently Asked

What does the name Thaddius mean?

It is a spelling variant of Thaddeus, an Aramaic apostle's name possibly meaning 'heart'; the exact root is debated.

How do you pronounce Thaddius?

It is said THAD-ee-us /ˈθæd.i.əs/, three syllables with the stress on the first.

Is Thaddius a boy or girl name?

Thaddius is used as a boy's name.

How popular is Thaddius?

It has always been rare in the United States, given to under twenty boys a year even at its peak in the late 1980s.

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