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Home › Baby Names Directory › Thadius

Thadius

♂ Boy

Pronounced THAY-dee-us /ˈθeɪdiəs/Medium

Meaning: A modern respelling of Thaddeus, from Aramaic via Greek, often glossed 'heart' or 'courageous.' Thaddeus was one of the twelve apostles, which we note.Low

In 30 seconds: A bold classic, restyled: Thadius respins Thaddeus, often 'heart, courageous' (said 'THAY-dee-us').
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Origin MediumAramaic
MeaningA modern respelling of Thaddeus, from Aramaic via Greek, often glossed 'heart' or 'courageous.' Thaddeus was one of the twelve apostles, which we note.
U.S. rank (2024)#10760 ↗ Rising
2024 U.S. births7 boys (0.00% of U.S. boys)
Peak year1974
Total births (all-time)≈ 511

Popularity in the U.S. · SSA data

peak 197419222024

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

Thadius restyles Thaddeus, from Aramaic through Greek, commonly glossed 'heart' or 'courageous.' Thaddeus was one of the twelve apostles, which we note. The variant spelling gives it a fresh edge. Bold and classic (said 'THAY-dee-us').

In the U.S. it appears rarely, a modern spin on a biblical classic. Bold, classic, and uncommon.

Did you know? Thadius is a modern respelling of Thaddeus - from Aramaic via Greek, often read 'heart' or 'courageous' - a name borne by one of the twelve apostles, which we note (said 'THAY-dee-us').
Overall data confidence 48%
References — Thadius — Respelling of Thaddeus; Aramaic/Greek; apostle

Variations

ThaddeusThaddiusTadeus

Nicknames

ThadTad

Famous Bearers

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If you like Thadius…

Thaddeus— the classic Thadius respins
Cyrus— a like stately -us ending name
Linus— a like vintage classical pick
Atticus— a like scholarly -us name

Explore names like Thadius

By themeclassicbiblicalrespellingbold
By meaningBrave / Courage

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Frequently Asked

What does the name Thadius mean?

Thadius respins Thaddeus, often glossed 'heart' or 'courageous,' the name of an apostle, which we note.

How do you pronounce Thadius?

It's said THAY-dee-us /ˈθeɪdiəs/ — three syllables, stress on the first.

Is Thadius a boy or girl name?

Thadius is used as a boy's name.

How popular is Thadius?

Thadius is a rare respelling of a classic name for boys in the U.S.

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