Isaias
Masculine · “Yahweh is salvation”
Isaias is the form the prophet's name took when it crossed from Hebrew into Greek and then into Latin — the spelling the Vulgate used, and the one the Douay-Rheims Bible carried into English before Isaiah won out. In Spanish and Portuguese it kept that shape and picked up an accent, Isaías, with the stress landing on a long open ee. Four syllables that move quickly and end soft.
How old is the name Isaias?
Isaias first appears in US birth records in 1915 — 110 years ago. The typical Isaias alive today was born around 2010, making them about 15 years old. About 18,000 people named Isaias are estimated to be alive in the US today.
When was the name Isaias most popular?
Isaias peaked in 2025, reaching #426 nationally. Today it ranks #426, exactly where it peaked. See the whole 2025 chart.
Lists built from the same records:
Where it comes from
From Yesha'yahu to Isaias
The story of Isaias
The name belongs first to the Hebrew prophet whose book stands among the longest in the Bible. When Jewish scholars in Alexandria translated those scriptures into Greek, Yesha'yahu became Ēsaias; Latin took it as Isaias, and that is the spelling Jerome used in the Vulgate and English Catholics used for centuries. Spanish and Portuguese inherited the Latin form directly and kept it, writing Isaías with the accent to mark the stressed vowel. English went a different way, back toward the Hebrew, and arrived at Isaiah — so the two spellings are the same name that took separate roads out of the same book.
Meaning
Yahweh is salvation
From Hebrew Yesha'yahu, joining the verb for saving with a short form of the divine name.
How the name formed
- Yesha'yahu
- Ēsaias
- Isaias
- Isaías
- Isaiah
Related forms: Isaías · Isaiah · Isaías · Isaia · Isaïe · Yeshayahu
Pronouncing Isaias
ee-sah-EE-as
That is the Spanish and Portuguese pronunciation, four syllables with the stress on the third. English speakers who read it as a version of Isaiah tend to say eye-ZAY-us, and both are heard in the US.
Nicknames for Isaias
High
What the data says
146 years of official birth records
The long climb, and where it stands now
The same years in position rather than babies
- First recorded
- 1915
- Most boys named
- 2025755 — the highest on record
- Peak rank
- #426reached in 2025
- Change vs 2023
- +7.1%755 in 2025, from 705
Rank is a position, a count is a headcount, and they move independently — a name can hold its rank while the number of babies behind it falls. Source: U.S. Social Security Administration.
Isaias in other languages
The same name elsewhere
- Isaías in Spanish — spelling variant
- Isaiah in English — same name
- Isaías in Portuguese — spelling variant
- Isaia in Italian — same name
- Isaïe in French — same name
- Yeshayahu in Hebrew — transliteration
Strongest US states over the last decade: California, Texas, Florida.
Isaiass among us
people named Isaias are estimated to be alive in the US today
About 1 boy in 2,262 born in 2025 was named Isaias
Estimated from SSA birth records and published actuarial life tables. Method
Is it right for you
What happens to a name after it peaks
The Alden test
Every popular name lives one long story — a climb, a peak, a slow settling back. Isaias's later chapters haven't been written yet, so we borrowed them: Alden climbed just as high around 1911, and its whole arc is on record. Line the two peaks up, and Alden's path sketches the road Isaias is walking now.
Isaias sits in the calm middle of the cycle — neither chasing a wave nor sliding off one. Middle-of-the-cycle names age slowly and predictably.
A scored estimate from 146 years of naming cycles — not a prophecy. Great names outlive statistics. How this is scored
Where Isaias is headed
Isaias should hold steady through 2030 — the curve is flat, and flat curves are the most predictable kind.
High confidence — fitted on official counts through 2025.
A damped-trend projection of the official birth data — a sketch of momentum, not a promise. Every name's forecast, ranked.
Isaias beside its neighbors
The names ranked closest to Isaias in 2025, in babies rather than position — the bars are to scale.
US boys given each name in 2025.
The trade-off
- Works unchanged in Spanish, Portuguese and Latin, and is recognizable in English through its close cousin Isaiah.
- A documented written record stretching back to ancient translations of the Hebrew Bible — the spelling is old, not modern.
- Established short forms already in circulation: Isa, Izzy, Zay.
- Common enough to be familiar in most classrooms, uncommon enough that a child is unlikely to share it with a peer.
- Two live pronunciations compete in the US — the Spanish ee-sah-EE-as and the anglicized eye-ZAY-us. A child will spend some time correcting people, and may end up answering to both.
- The accent in Isaías tends to fall off in American paperwork, school rosters and email systems, which quietly nudges the pronunciation toward the English one.
- It sits close to Isaiah and to Isaí, and gets mistaken for both in writing. Worth deciding early which spelling goes on the birth certificate and holding to it.
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What they receive
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Isaias
Masculine · #426 in the U.S.
Frequently asked
- How many Isaiass are there in the world?
- No country counts the world's names, so there is no worldwide figure — anyone quoting one is estimating. About 18,000 people named Isaias are estimated to be alive in the US today.
- How popular is the name Isaias in 2025?
- Isaias ranks #426 among US boy names in 2025, with 755 babies given the name.
- How rare is the name Isaias?
- About 1 in every 2,262 US boys born in 2025 was named Isaias — 755 in all.
- Will my child share the name Isaias with classmates?
- Isaias will almost certainly be the only one in school.
Ranked beside Isaias
Names sitting at a similar level of popularity right now.
Tadeo#427 · Lucca#425 · Lian#428 · Julius#424 · Boone#423 · Wilder#429 · Nehemiah#429 · Pablo#429
Looking for what else is popular rather than what resembles Isaias? See the current top 100.
Choosing between Isaias and another name?
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US figures from the Social Security Administration. 1880–2025. Data & methodology
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