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Thaddaeus

#8,181 in 2025Boys' name

Form of Thaddeus

Thaddaeus has been given to 1,045 babies in the U.S. since 1924. In 2025 it ranked #8,181 of 13,926 boys’ names in use. Its peak year was 2005, with 29 recorded.

Babies named Thaddaeus, 2025

1 in 332,000

Thaddaeus over time, 1880–2025

Boys
010203018801900192019401960198020002020

Based on births in the U.S. Babies given the name each year. Hover the chart — or focus it and use the arrow keys — for any year. Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Thaddaeus: meaning, origin, and history

Form of Thaddeus

Ancient Greek

What Thaddaeus means

Thaddaeus is a form of Thaddeus.

Meaning behind the documented name family

The name developed through Thaddaeus → Thaddeus. The family’s proposed meaning is “heart, breast”, recorded in the naming reference for Thaddeus.

Dictionary etymologyReferences, data & attribution

Borrowed from Latin Thaddaeus, from Ancient Greek Θαδδαῖος (Thaddaîos), from Aramaic תַדַּי (Ṯaday).

Excerpt from Wiktionary: Thaddaeus (English) · CC BY-SA 4.0

Wiktionary material is available under CC BY-SA 4.0.

Origin, language, and formation

Thaddaeus is used in English. Its origins include Ancient Greek.

Thaddaeus comes through Latin Thaddaeus, Ancient Greek Θαδδαῖος and Aramaic תַדַּי.

Related names and everyday forms

Related names include Thaddeus.

Pronunciation and spelling

In English, Thaddaeus is pronounced /ˈθædiːəs/.

American usage and historical context

In the United States, 1,045 boys were recorded with the name Thaddaeus between 1924 and 2025. Its highest annual count was 29 in 2005; its best national rank was #2,271 in 1978.

Over 5 years its rank fell, from #4,678 in 2020 to #8,181 in 2025. Over 10 years its rank fell, from #5,716 in 2015 to #8,181 in 2025.

How common is Thaddaeus?

Everything below is computed from the 2025 data — the most recent year available.

Among all babies, 2025
1 in 332,000
10 of 3,315,165 births
Among boys only
1 in 171,000
<0.01% of boys
Rank, 2025
#8,181
of 13,926 boys’ names in use
Coin-flip room size
229,791 kids
Even odds of a second one

Where Thaddaeus sits on the popularity scale

Rarest published (5 a year)#1 — Liam (20,818)

Chance at least one other child shares the name

If the other children were drawn at random from the 2025 national name distribution. Real classrooms cluster by region and community, so treat these as a floor, not a ceiling.

Class of 20Under 1%
Class of 30Under 1%
Grade of 100Under 1%
School of 500Under 1%

Put another way: gather 229,791 children born in 2025 and it's an even bet that one of them is another Thaddaeus. In a class of 30 the chance is Under 1%.

When Thaddaeuss were born

Half of everyone ever recorded as Thaddaeus was born before 2000 — so the typical Thaddaeus is around 25 today.

Median birth year
2000
About 25 years old
Biggest decade
2000s
21.5% of all use
Born in the last 25 years
47.9%
Spread across generations
Recorded since 1950
1,033
People you could plausibly meet
Choose a decade

2000s — 21.5% of all recorded uses (225).

Is Thaddaeus rising or falling?

Rank movement and count movement can disagree — the number of distinct names in use keeps growing, so a name holding a steady count still slides down the list. Both are shown.

Rank vs 1 year ago
−2,316
Places dropped
Rank vs 5 years ago
−3,503
Places dropped
Rank vs 10 years ago
−2,465
Places dropped
Births vs 10 years ago
0.63×
Fewer babies than then
Share of its own peak
34.5%
Peak was 2005 (29)
Years since peak
20
Years
Year-to-year steadiness
Volatile
27.0% average annual change
Best rank ever
#2,271
1978

Spellings of Thaddaeus

Thaddaeus is not the most common spelling — Thaddeus is, with 90.4% against Thaddaeus's 3.6%.

Grouped by closeness of spelling (up to two letter changes), same sex, with a floor on all-time use. It catches Sophia/Sofia and Aiden/Ayden, and misses spellings that sound alike but look different, like Sean and Shawn.

Where Thaddaeus is used

Across 1910–2025, Thaddaeus was most concentrated in Ohio — about 1 in — boys, against 1 in 835,706 across all states with data. It was least common in Washington (1 in —).

00 per 100,000

Most concentrated

  1. 1Ohio1 in —
  2. 2Washington1 in —

Shading is the share of that state's recorded boys given this name, not the raw count — otherwise the map would just show which states are biggest. Unshaded states have no published records for this period. U.S. birth records suppress state-year counts below 5; state counts therefore don't add up to the national total. Every state links to its full rankings. Thaddaeus has too little recent state data to map, so this covers all years from 1910.

Thaddaeus around the world

Where Thaddaeus ranks in official birth records elsewhere in the world. Rankings only — the number of births isn’t comparable between places, so it isn’t shown.

  • England & Wales
    2017–2017
    #4,812
    in 2017
  • South Australia
    1989–1989
    #478
    in 1989

Popularity data from Office for National Statistics and Consumer and Business Services (South Australia). ONS data under Open Government Licence v3.0. CBS SA data under CC BY 4.0.

Thaddaeus by the numbers

The raw record for each sex the name is used for.

As a boy's name

Rank in 2025
#8,181
Trend vs 5 yrs ago
Down 3,503
Best rank ever
#2,271
1978
Peak year
2005
29 that year
First recorded
1924
Last recorded
2025
All-time count
1,045
Count in 2025
10

Names similar to Thaddaeus

Matched on shared beginnings and endings, similar length, and comparable popularity.

ThadeusThaddeusZacchaeusThatcherThayerThaddiusThayneThailandOdysseusZaccheusPerseusThaxtonMatheusAmadeusThaddeausThangThadiusAndreusAchilleusMateusMattheusTheseusThaiThane

Sibling names for Thaddaeus

Names from the same era and popularity tier — the two things that make a sibling set feel deliberate — skipping lookalike spellings and shared initials.

Explore around Thaddaeus

Top names of 2005, Thaddaeus's peak yearThe 2000s in fullOther names that peaked in 1978Boys' names starting with T