boy's name
Isaias
ee-sah-EE-as
- Origin Hebrew
- Gender Boy
- Letters 6
- Popularity Top 1000 (US)
- Births on record 18,822
the United States
#426
2025 births
Isaias is a boy's name of Hebrew origin meaning "Yahweh is salvation". It is the Spanish and Portuguese form of Isaiah, the prophet whose book supplies more of the language of Christmas and of Handel's Messiah than any other.
- Isaias is a name of Hebrew origin.
- Peaked in 2025, when 755 babies were given the name.
- It has been rising over the past decade.
- Today about 1 in 4,391 babies in the United States is given this name.
- First appears in US birth records in 1915.
Isaias over time
Births per decade in the United States, 1910s to 2020s. The striped bar is the 2020s, still in progress — it covers 2020 to 2025, not a full ten years.
Show the numbers
| Decade | Births |
|---|---|
| 1910s | 18 |
| 1920s | 98 |
| 1930s | 144 |
| 1940s | 150 |
| 1950s | 222 |
| 1960s | 242 |
| 1970s | 502 |
| 1980s | 985 |
| 1990s | 2,335 |
| 2000s | 4,664 |
| 2010s | 5,212 |
| 2020s (to 2025) | 4,072 |
What Isaias means
Isaias means the Lord saves, joining a verb meaning to save or deliver to a short form of the divine name. It is a statement about God rather than a description of the child.
Where Isaias comes from
Isaias renders the Hebrew Yeshayahu, from yasha, to save or deliver, and yah, the divine name — the same verb behind Joshua and Jesus. The prophet Isaiah worked in Jerusalem in the eighth century BC, and his book is the most quoted prophetic text in the New Testament; the passages about a child born and a suffering servant shaped Christian reading of the Gospels and supplied Handel much of his libretto. Greek gave Esaias, Latin Isaias, and Spanish and Portuguese kept that form. It appears in our records from 1915 and reached its highest use in 2025.
Isaias in use
Isaias charts in only four of the seven countries we track and reached its highest recorded use in 2025.
How popular is Isaias?
In 2025, Isaias was given to 755 babies in the United States, ranking #426 that year. It is a well-established, commonly used name.
Where Isaias is used
US figures omit any name given to fewer than five babies in a year, so the rarest names are absent from the source rather than absent from use. Data & sources.
How Isaias is spelled
Birth registers count each spelling separately, so every one has its own ranking.
| Spelling | What it is | Births on record |
|---|---|---|
| Isaïas | Isaïas is a rare spelling of Isaias, written with a diaeresis and recorded about 5 times, mostly in France. | 5 |
Names that peaked alongside Isaias
These names rose and fell in the same era, which is why they tend to sound like they belong together.
Parents who like Isaias also like
Names whose popularity has risen and fallen in step with Isaias over the last century — the same taste, a different name.
2 nicknames for Isaias
Each one is a name in its own right — the figure underneath is how it is doing today, so you can see which short forms are rising and which have faded.
Isaias in other languages
The same name as it is spelled elsewhere — not shortenings, and not different names that merely sound alike. Each one has its own record here.
Sibling names for Isaias
Names from the same era that won't rhyme or share an initial with Isaias — the two things that make a sibling set grate.
Common questions about Isaias
What does the name Isaias mean?
Yahweh is salvation, from the Hebrew yasha, to save, and yah — the same verb behind Joshua and Jesus.
Is Isaias the Spanish Isaiah?
Yes, and the Portuguese one. Both come through the Latin Isaias.
How do you pronounce Isaias?
ee-sah-EE-as in Spanish, four syllables.
How popular is the name Isaias?
In 2025, Isaias was given to 755 babies in the United States, ranking #426 that year. It is a well-established, commonly used name.
Is Isaias a girl's or a boy's name?
Isaias is given almost entirely to boys in birth records.
When was Isaias most popular?
Isaias peaked in 2025, when 755 babies were given the name. It has been rising over the past decade.
What are the nicknames for Isaias?
Isaias is usually shortened to Isa and Zay.
Is Isaias a good name?
That is not something records can settle, but they can tell you what you would be choosing. Isaias currently ranks #426 in the United States. It has been rising over the past decade. Everything else — how it sounds with your surname, who it reminds you of — is yours.