Noah Boy
NOH-uh
“rest, comfort” · Hebrew
#2
Tadeo
BoySpanish, Aramaic· “uncertain; form of Thaddeus”
- Meaning
- uncertain; form of Thaddeus (origin disputed)
- Origin
- Spanish, Aramaic
- Pronunciation
- tah-DAY-oh
- Syllables
- 2
- US rank 2025
- #427
- US babies 2025
- 753
- Best rank
- #412 (2024)
- Peak year
- 2024
Meaning and origin of Tadeo
Tadeo is often said to mean “uncertain; form of Thaddeus”; the origin is uncertain, though it is usually linked to Spanish and Aramaic roots.
Tadeo is the Spanish form of Thaddeus, one of the twelve apostles, often identified with Saint Jude. The origin of Thaddeus is uncertain; it may come from an Aramaic word meaning breast or heart, or it may be related to a Greek name, and scholars have not settled the question. Saint Jude Thaddeus is widely venerated as the patron of difficult causes, especially in Mexico. Tadeo has a friendly, lively sound and a rich spiritual heritage. Tad and Teo are easy nicknames, and it pairs well with short middle names.
Popularity over time
Tadeo first appears in US Social Security records in 1968. It has ranked in the top 1,000 in 10 different years, starting in 2016. Its best national rank was #412 in 2024, the same year it reached its highest count of 782 babies. In 2025, 753 babies were named Tadeo, and it ranked #427 nationally. That is 298% more than ten years earlier, so it is clearly on the rise.
Its national rank moved from #6,254 in 2000, #2,257 in 2010, and #427 in 2025. Of the 5,843 US boys named Tadeo since records began, 61% were born in the 2020s, its biggest decade. The 2010s come next, with 1,847 babies.
Other boys' names that peaked around the same time include Leandro, Koda, Hank, Augustus, and Kaysen.
Where it is most popular (2025)
In 2025, Tadeo ranked highest in California, Arizona, and Texas.
| State | Rank there | Babies |
|---|---|---|
| California | #192 | 192 |
| Arizona | #231 | 36 |
| Texas | #253 | 155 |
| Oregon | #279 | 16 |
| Washington | #307 | 25 |
Gender, sound and spelling
In the US it is used almost only for boys.
Tadeo is usually pronounced tah-DAY-oh, with two syllables. It has five letters, starts with T and ends in “-eo”.
Middle names for Tadeo
A few middle names that flow with Tadeo: each avoids a matching first letter, a rhyme and a vowel clash where the names meet.
Sibling names for Tadeo
Similar names
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Lists that include Tadeo
Frequently asked questions
What does the name Tadeo mean?
Tadeo is often said to mean “uncertain; form of Thaddeus”; the origin is uncertain, though it is usually linked to Spanish and Aramaic roots.
What is the origin of the name Tadeo?
Tadeo has Spanish and Aramaic roots. Tadeo is the Spanish form of Thaddeus, one of the twelve apostles, often identified with Saint Jude.
Is Tadeo a popular name?
Yes. Tadeo ranked #427 in the US in 2025, which makes it in the top 1,000.
Is Tadeo a boy or girl name?
Tadeo is mainly a boy's name. In the US it is used almost only for boys.
How do you pronounce Tadeo?
Tadeo is usually pronounced tah-DAY-oh. Stressed syllables are in capital letters.
Popularity figures come from US Social Security card applications (names given to at least five babies in a year, 1880 to 2025). How we source names and meanings