Sidnei
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Meaning
the Brazilian spelling of Sidney, an English surname underneath; a 1960s and 70s Brazilian standard
How popular is Sidnei around the world?
In the United States, Sidnei is not on the Social Security record for 2020 to 2025: names under 5 in a year are withheld at source. At the 2022 census, 64,272 people in Brazil were named Sidnei, the 476th most common name, with a median age of 44.
Sidnei is on the official records of Brazil and Spain.
United States
under 5 a year
In the United States, Sidnei is not on the Social Security record for 2020 to 2025: names under 5 in a year are withheld at source.
Births with a Social Security record. Source: U.S. Social Security Administration
Brazil
1 in 3,200
At the 2022 census, 64,272 people in Brazil were named Sidnei, the 476th most common name, with a median age of 44.
Among people named Sidnei living in Brazil at the 2022 census, more were born in the 1970s than in any other decade.
people alive at the 2022 census, by decade of birth
The census also counted 119 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
Spain
1 in 1.3M
In Spain, 34 residents are named Sidnei, ranked 20,047th among men, with a mean age of 45.9 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
Not on 15 other recordsWhy
- Not on the record in Mexico City, Argentina, Puerto Rico, England and Wales, Canada, Ireland, New Zealand, Scotland and Poland: those registries withhold small counts, so rare uses may sit below their floors.
- Not on the Chile record: nametree keeps spellings that reached 5 registrations in some year, so rarer uses are not shown.
- Not on the Montevideo record for 1940 to 2011: that registry withholds nothing, so this spelling was not given there in those years.
- Not on the France record: nametree keeps spellings that reached 20 births in some year, so rarer uses are not shown.
- Not on the South Australia record for 1944 to 2017: that registry withholds nothing, so this spelling was not given there in those years.
- 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.
Keep exploring
The Sidnei deep dive
Whether you’re naming a baby or exploring your own name’s history, this is a personal letter, not a list: where Sidnei 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 Sidnei fits with your family’s names and surname.
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