Isaias
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Meaning
Spanish variant of Isaiah, "Yahweh is salvation"
The story
Isaias is Isaiah in Spanish, Yahweh is salvation, the prophet's name worn the Iberian way, and its American record is one of the longest staircases the ledger holds: higher every decade from the 1910s through the 2010s, ten consecutive rises, about 18 becoming 5,200. This decade stands at 4,100 so far, closing on the full 2010s with years to run, and the record is absolute in one respect: about 18,600 boys and not one girl, ever. Isaiah, the English spelling, is a giant at about 254,400 with its own story here. Ten decades of rising without a single stumble is the community-carried signature at its purest, the same patient stairs Rafael, Esteban and Eduardo climb on this shelf: a prophet's name, carried up one generation at a time.
How popular is Isaias around the world?
In the United States, 4,072 babies were named Isaias between 2020 and 2025. In Argentina, 1,888 newborns were given the name Isaias in 2024.
Isaias is on the official records of the United States, Argentina, Puerto Rico, Chile, Mexico City, Brazil, Montevideo, Spain, Canada and England and Wales.
United States
1 in 5,400
In the United States, 4,072 babies were named Isaias between 2020 and 2025.
Shape drawn from US Social Security baby-name records. Isaias peaked in the 2020s.
Births with a Social Security record. Source: U.S. Social Security Administration
Argentina
1 in 350
In Argentina, 1,888 newborns were given the name Isaias in 2024.
share of that year’s name registrations
Given-name components of births in Argentina 2012–2024; national cells are lower bounds and no sex split is published. Source: RENAPER (Argentina), Dirección Nacional de Población, given names 2012-2024
Puerto Rico
1 in 530
In Puerto Rico, 34 babies were named Isaias in 2025, and 829 have carried the name since 1998.
share of that year’s births on record
First given name only, from Social Security records of births in Puerto Rico; any name-sex-year under 5 births is withheld at source. Shares divide by the Puerto Rico Demographic Registry’s count of births on the island; the 2025 count is provisional. Source: U.S. Social Security Administration, territory name file (Puerto Rico)
Chile
1 in 1,100
In Chile, 158 boys were registered as Isaias in 2021, every accent spelling counted together, most often written Isaías.
share of that year’s name registrations
First-name registrations with Chile’s civil registry by year of registration, 1920–2021, counted as spelling groups (Sofía, Sofia and Sofìa are one name, shown with its most-registered spelling); the registry withholds nothing, nametree keeps the groups that reached 5 registrations in some year, and shares divide by every registration of the year. Source: Servicio de Registro Civil e Identificación (Chile) via the guaguas package, first-name registrations 1920-2021
Mexico City City
1 in 1,200
In Mexico City, there were 95 registrations of Isaias in 2022.
share of that year’s registrations in the city
Civil-registry acts in Mexico City by registration year. Counts are lower bounds (names under 6 in a month and borough are removed at source) and count name-instances, not people; compound names are split, so “Maria Jose” counts under each part. 2023 (7 registrations through 3 Mar) is excluded as partial. Source: Registro Civil of Mexico City, open data portal, registered given names 2000-2023
Brazil
1 in 2,600
At the 2022 census, 77,888 people in Brazil were named Isaias, the 394th most common name, with a median age of 38.
Among people named Isaias living in Brazil at the 2022 census, more were born in the 1980s than in any other decade.
people alive at the 2022 census, by decade of birth
The census also counted 3,524 born between 2020 and August 2022, too recent a span to chart. People alive and resident in Brazil at the 2022 census, a living-population count, not births; names under 20 are withheld at source. Source: IBGE, Censo Demográfico 2022
Montevideo City
1 in 2,7002011
In Montevideo, 9 boys named Isaias were born in 2011, spelling variants counted together.
share of that year’s births on record
Births in the department of Montevideo (not all of Uruguay) by first name and year of birth, 1940–2011, from the city’s civil registry, which writes names in capitals, almost always without accents; counted as spelling groups (accent and punctuation variants merged), nothing is withheld at source, and 2012 is excluded as a partial year. Source: Servicio de Registro Civil, Intendencia de Montevideo, Partidas de Registro Civil de Montevideo (Licencia de Datos Abiertos - Uruguay); 2012 dropped as partial
Spain
1 in 13,000
In Spain, 3,331 residents are named Isaias, the 568th most common name among men, with a mean age of 43.3 years.
Residents of Spain on 1 January 2025. Spain publishes how old a name’s living bearers are, not a birth series, so there is no year chart. Source: INE (Spain), Censo de Población anual, 1 January 2025
Canada
1 in 73,000
In Canada, 5 boys named Isaias were born in 2024, ranked 3,231st among boys that year.
The count never rose above 9 in a year, too few to chart.
First given names from provincial and territorial vital statistics across Canada; any name-sex-year under 5 is excluded at source, and small Quebec counts carry a randomized adjustment made at source. Shares divide by Statistics Canada’s count of live births for the year; the 2024 count is preliminary. Source: Statistics Canada, first names at birth (table 17-10-0147-01)
England and Wales
1 in 98,000
In England and Wales, 6 boys named Isaias were born in 2025, ranked 3,256th among boys that year.
The count never rose above 8 in a year, too few to chart.
Birth registrations in England and Wales (not the whole UK); exact spellings are counted separately, and any spelling under 3 in a year is withheld at source. Source: Office for National Statistics, baby names in England and Wales
South Australia
last on record 2003
Isaias is not on the 2017 record for South Australia, whose registry publishes every name given that year.
The count never rose above 1 in a year, too few to chart.
Births registered in South Australia (not all of Australia) by first name and year of registration, 1944–2017, from the state’s Births, Deaths and Marriages registry, which publishes every name down to a single birth in capitals; a spelling its export repeats inside a year is counted once, and from 2018 only a top 100 is published, so the series ends at 2017. Source: Consumer and Business Services (South Australia), popular baby names
Not on the record in Ireland, New Zealand, Scotland and Poland: those registries withhold small counts, so rare uses may sit below their floors.
Not on the France record: nametree keeps spellings that reached 20 births in some year, so rarer uses are not shown. Not on the Austria record for 1984 to 2025: Statistik Austria publishes every first name down to a single birth, so this name was not given there in those years (before 2010 the record covers babies with Austrian citizenship only). Not on Norway’s list: Statistics Norway lists only first names carried by 200 or more living people, so rarer names are not shown.
When you meet Isaias
Most people given the name Isaias in the United States are children or teenagers today. The name belongs to this generation.
Estimated from US Social Security birth registrations and typical lifespans; a rough guide, not a rule.
Keep exploring
The Isaias deep dive
Whether you’re naming a baby or exploring your own name’s history, this is a personal letter, not a list: where Isaias truly comes from, how it traveled, and what a century of records reveals. If you have grown a tree on nametree, it also considers how Isaias fits with your family’s names and surname.
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