"Philip, and Bartholomew; Thomas, and Matthew the publican; James the son of Alphaeus, and Lebbaeus, whose surname was Thaddaeus."
Biblical Name · Aramaic Origin
Thaddeus Meaning in the Bible
Thaddeus
boy
Thaddeus means "Courageous heart; Breast/Heart", a boy's name of Aramaic origin. Thaddeus appears in the King James Bible, and Matthew 10:3 is the passage most often tied to it. Thaddeus asked the question that unlocked one of Jesus' deepest teachings — showing that honest questions born from a courageous heart lead to profound revelation.
Is Thaddeus in the Bible?
Yes — Thaddeus appears in the King James Bible, including Matthew 10:3.
Pronunciation:/THAD-ee-us/
OriginAramaic
MeaningCourageous heart; Breast/Heart
What does Thaddeus mean?
Thaddeus is a boy name of Aramaic origin meaning "Courageous heart; Breast/Heart". Thaddeus means "courageous heart" or is derived from the Aramaic word for "breast" or "heart." He was one of the twelve apostles, also known as "Lebbaeus" (Matthew 10:3) and "Judas, not Iscariot" (John 14:22).
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Editor’s reflection
The apostle with three names — and the one who asked Jesus the question at the Last Supper.
Thaddeus (Greek Θαδδαῖος) most likely derives from Aramaic taddaʾ, 'breast' or 'heart,' giving the traditional sense 'heart, courageous of heart.' An older suggestion links it to a shortened form of a Greek name such as Theodotus, but the Aramaic reading fits the apostolic name lists better.
He appears in Matthew 10:3 as 'Lebbaeus, whose surname was Thaddaeus' and in Mark 3:18 as Thaddaeus. Luke and Acts instead list 'Judas the brother of James' in the same position, which is why the church has traditionally treated Jude, Judas of James and Thaddeus as one apostle — a man who very likely used a second name to avoid confusion with Judas Iscariot.
His one recorded line is a good one. At the Last Supper, 'Judas saith unto him, not Iscariot, Lord, how is it that thou wilt manifest thyself unto us, and not unto the world?' (John 14:22). It is the question of someone who expected a public Messiah and is trying to understand a hidden one. Thaddeus remains a strong, uncommon boys' name today with the friendly short forms Thad and Tad.
“Lord, how is it that thou wilt manifest thyself unto us, and not unto the world?”
Why parents choose Thaddeus today
- •Classical, weighty sound with an easy everyday nickname in Thad
- •Apostolic without being as heavily used as Matthew, Thomas or James
- •Long-standing Catholic devotion to St Jude Thaddeus keeps it familiar
What does Thaddeus mean in the Bible?
Thaddeus means "Courageous heart; Breast/Heart" and is a name of Aramaic origin. Below is what Scripture and Christian tradition attach to that meaning.
Thaddeus means "courageous heart" or is derived from the Aramaic word for "breast" or "heart." He was one of the twelve apostles, also known as "Lebbaeus" (Matthew 10:3) and "Judas, not Iscariot" (John 14:22).
Thaddeus is one of the quieter apostles in Scripture, but his single recorded question to Jesus is profoundly important: "Lord, how is it that thou wilt manifest thyself unto us, and not unto the world?" Jesus' response revealed that God's self-revelation comes through loving obedience: "If a man love me, he will keep my words."
Church tradition holds that Thaddeus carried the Gospel to Mesopotamia and Persia, ultimately dying as a martyr. His willingness to ask the question others might have been afraid to voice, and then to carry the answer to distant lands, makes him a model of courageous faith.
Where does Thaddeus appear in the Bible (KJV)?
Thaddeus is connected to 1 key passage in the King James Bible, beginning with Matthew 10:3. Each verse is quoted in full below.
"Judas saith unto him, not Iscariot, Lord, how is it that thou wilt manifest thyself unto us, and not unto the world? Jesus answered and said unto him, If a man love me, he will keep my words."
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What are the variants and nicknames of Thaddeus?
Thaddeus has 1 recorded variant, short form, and translation across languages and biblical traditions.
Variants & related forms
Which books of the Bible mention Thaddeus?
Thaddeus is mentioned across 4 books of the Bible. Follow any book below to read it in the KJV.
What is the spiritual meaning of Thaddeus?
Thaddeus asked the question that unlocked one of Jesus' deepest teachings — showing that honest questions born from a courageous heart lead to profound revelation.
Related Promises of God
Promises connected to the meaning of the name Thaddeus:
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What names are related to Thaddeus?
Names like Thaddeus
Other Aramaic biblical names that share the spirit of "Courageous heart; Breast/Heart" — discovered by matching meaning category and origin.
Names that pair well with Thaddeus
Sibling sets, middle-name combinations, and complementary pairings chosen for matching origin, meaning, and similar syllable weight.
Share the meaning of Thaddeus
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Thaddeus name meaning: frequently asked questions
Traditionally yes. Matthew and Mark list Thaddaeus among the twelve where Luke and Acts list 'Judas the brother of James.' The usual explanation is that one man was known by both names, with Thaddeus used to distinguish him from Judas Iscariot. Whether he wrote the Epistle of Jude is a separate and much-debated question.
Yes — Thaddeus appears in the King James Bible, including Matthew 10:3.
Thaddeus means "Courageous heart; Breast/Heart." It is an Aramaic name. The King James Bible uses it in Matthew 10:3, so the meaning is carried by a real person in Scripture.
Common questions about the name Thaddeus
Can I download a free King James Bible PDF to study the name Thaddeus?
Yes. The complete King James Bible is available as a free PDF download — all 66 books, 1,189 chapters, ready to read offline or print. No sign-up required.
Where can I read the full biblical context for Thaddeus?
You can read every verse where Thaddeus appears in the King James Bible by downloading the free KJV PDF or reading online. The download page also includes a bookmarked Book of Psalms KJV PDF for easy reference.