Zosia
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Meaning
wisdom (Polish diminutive of Zofia/Sophia)
The story
Zosia is the Polish diminutive of Zofia, the Slavic form of Sophia, wisdom, and in Poland it carries the warmth of a household name: the Zosia of Mickiewicz's Pan Tadeusz, the national epic, is one of Polish literature's beloved heroines, which gives the name a place in every Polish classroom. Like many diminutives it has stepped forward as a given name in its own right, and American ears met it through the actress Zosia Mamet. Pronounced ZO-sha, it is rare in US records since 1890, kept mostly within Polish-American families, which leaves it distinctive: the familiar Sophie universe, entered through a side door almost nobody in America uses. Wisdom, in the affectionate case. The diminutive status adds intimacy in Polish, even when American use treats Zosia as fully formal.
The formal names behind Zosia
Zosia is an established short form of each of these names.
Sophia · Greek origin · "wisdom," from Greek sophia; Hagia Sophia means "Holy Wisdom", a dedication to divine wisdom
Zofia · Polish origin · wisdom (Polish form of Sophia)
Sources list Zosia among the forms of Sophia (Polish).
How popular is Zosia around the world?
In the United States, 196 babies were named Zosia between 2020 and 2025. In Poland, 8 girls named Zosia were born in 2025, the 381st most common name among girls that year.
Zosia is on the official records of the United States, Poland and England and Wales.
United States
1 in 110,000
In the United States, 196 babies were named Zosia between 2020 and 2025.
Shape drawn from US Social Security baby-name records. Zosia has stayed rare in US records the whole time: no peak decade to name.
Births with a Social Security record. Source: U.S. Social Security Administration
Poland
1 in 31,000
In Poland, 8 girls named Zosia were born in 2025, the 381st most common name among girls that year.
share of that year’s name registrations
First names given to children born in Poland by year of birth, 2000–2025, from the PESEL population register (Ministry of Digital Affairs); exact spellings count separately (Łukasz and Lukasz are different names), names given fewer than 5 times in a year were left off the list through 2012 and fewer than 2 times from 2013, and the register also counts children born abroad, so its yearly sums run above Poland’s live births. Shares divide by the register’s own published total for the year, never by births. Source: Ministry of Digital Affairs, PESEL register (dane.gov.pl)
England and Wales
1 in 65,000
In England and Wales, 9 girls named Zosia were born in 2025, ranked 2,788th among girls that year.
share of that year’s name registrations
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
Canada
last on record 2023
Zosia is not on the 2024 record for Canada, where names under 5 in a year are excluded at source.
The count never rose above 8 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)
Ireland
last on record 2019
Zosia is not on the 2025 record for Ireland, where names under 3 in a year are withheld at source.
The count never rose above 5 in a year, too few to chart.
Exact registered spellings from Irish vital statistics; any name under 3 in a year is withheld at source, and accented spellings (fadas) are recorded reliably only from 2018. Source: Central Statistics Office (Ireland), Irish babies' names
Scotland
last on record 2016
Zosia is not on the 2024 record for Scotland, where spellings under 3 in total are suppressed at source.
The count never rose above 3 in a year, too few to chart.
Births registered in Scotland; different spellings count separately but accents are merged at source, and any spelling under 3 in total is suppressed. Source: National Records of Scotland, babies' first names
South Australia
last on record 2015
Zosia 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 Spain, Mexico City, Argentina, Puerto Rico and New Zealand: 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 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 Zosia
Most people given the name Zosia 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 Zosia deep dive
Whether you’re naming a baby or exploring your own name’s history, this is a personal letter, not a list: where Zosia 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 Zosia fits with your family’s names and surname.
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