Janusz
given name · Latin script
Meaning: from the personal name Janusz, a derivative of Jan
Recorded as a male name· opposite-gender records fall within measured source noise
Janusz is a given name written in the Latin script, with more bearers in Poland than in any other country, where it is the 51st most common given name.
- PLPoland1 in 221(measured from records)
- GBUnited Kingdom≈1 in 49K
- USUnited States1 in 131K
carrying the name, as counted by its national register where one exists and as Mondonomo estimates it elsewhere (marked ≈ and "est." on hover). One hue, darker where it is more common; hover a country for its figure.
- Poland (measured from records)
- Sources
- 238 (measured from records)
- 1 in 221 (inferred from the name graph)
173,146 people, 2026
Highest-authority source
Poland
measured from records inferred from the name graph
Meaning & origin(measured from records)
from the personal name Janusz, a derivative of Jan.
Sources 1
- Dictionary of American Family Names
Attested across 20 languages in the etymology graph.
Where in the world(measured from records)
Janusz counted together with the spellings and other-language forms grouped with it. Where a register counted another spelling, the row names it.
Sorted by bearers: national registers' counts, and Mondonomo's estimates (≈, est.) where no register counts.
| Country | Most common spelling | Sources | ||||
|---|---|---|---|---|---|---|
| PL Poland | #51 | 173,146 | 1 in 221 | 177K | Janusz | 192 |
| CN China | — | ≈5,800 est. | ≈1 in 242K | — | Janusz | 8 |
| US United States | — | 2,537 | 1 in 131K | 2.5K | Janusz | 238 |
| GB United Kingdom | — | ≈1,400 est. | ≈1 in 49K | — | Janusz | 105 |
| SE Sweden | — | 740 | 1 in 14K | 740 | Janusz | 30 |
| NO Norway | — | 573 | 1 in 9.5K | 1.6K | Janusz | 19 |
| IS Iceland | — | 96 | 1 in 3.7K | 96 | — | — |
| FO Faroe Islands | — | ≈2 est. | ≈1 in 30K | 2 | — | 1 |
173,146 people counted by dane.gov.pl — PESEL given names (first + second name position, 2026-01-20), 2026. Exact figures are national registers' own counts, while figures marked ≈ and est. are Mondonomo’s estimates, counted from our sources and calibrated against those registers; hover one for how far to trust it in that country. A dash means neither exists.
Registers cited: dane.gov.pl — PESEL given names (first + second name position, 2026-01-20); dane.gov.pl — PESEL living persons (names); Census Bureau — First Name Frequency 2020 by sex; SSB PxWebApi — Persons/Last names by year (StatBank tables 10501/12891); SSB — Navnesøk (name-search service, living population); Skatteverket — Sök hur många som har ett visst namn (living population); Þjóðskrá Íslands — Name frequencies (NafnTíðni, registry); Hagstova Føroya — Given names, living population (PX-Web, 2024). Figures without a register are Mondonomo estimates; see Methodology.
Country figures for a list of names, at full precision, are available under licence rather than by scraping this table (how that works).
Other recorded senses(measured from records)
Janusz is also recorded in 3 other lexicons, as a different name or as an ordinary word. These are senses of the spelling, not of the name above.
In Polish, alternative letter-case form of janusz
as a wordkaikki.org Wiktionary extract (IPA + transliterations)
In Swedish, Janusz är en polsk smekform till → Jan.
as a nameFörnamn i Sverige. Kortfattat namnlexikon
Polish: pet form of JAN (1) , now also used as an independent given name.
as a word
Ordered by how much of this spelling's record each language holds, so a sense from a language the name is barely used in sits last rather than first.
Notable people with this name(measured from records)
- Janusz Radziwiłłb. 1880PLPolish diplomat (1880-1967)
- Janusz Kusocińskib. 1907PLPolish long distance runner (1907-1940)
- Janusz Sidłob. 1933PLathletics competitor (1933-1993)
- Janusz Onyszkiewiczb. 1937PLPolish politician
- Janusz Głowackib. 1938PLPolish writer (1938–2017)
- Janusz Gajosb. 1939PLPolish actor
- Janusz Korwin-Mikkeb. 1942PLPolish far-right politician and publicist (born 1942)
- Janusz Kupcewiczb. 1955PLPolish association football player (1955–2022)
- Janusz Kamińskib. 1959PLPolish cinematographer
- Janusz Palikotb. 1964PLPolish politician, activist and businessman
The ten people covered by the most Wikipedia language editions — a proxy for cross-cultural notability, which favours historical and Western figures over equally prominent contemporary ones — shown by birth year. Source: Wikidata (CC0).
Evidence(measured from records)
Attested in 51 sources across 23 countries.
Reference works 7
- Dictionary of American Family Names
- Nederlandse FamilienamenBank (Dutch surname bank; ex-Meertens Instituut, now CBG)2007
- Wikipedia given-name tokens
- Wikipedia surname tokens
- Wikidata name items (native-script + romanized given/family names)
- Rymut, Słownik nazwisk współcześnie w Polsce używanych (10 vols, IJP PAN, Kraków 1992–1994) — every Polish surname in the PESEL register at the end of 1990, with bearer counts nationally and per voivodeship1990
- Hoffman, Polish Surnames: Origins and Meanings (2nd ed., 2012)
These works list the name; their figures are licensed and are not reproduced here.
Register rows as of the 2026-10-09 data build.
Frequently asked questions
- What does the name Janusz mean, and where does it come from?
- from the personal name Janusz, a derivative of Jan. Recorded by Dictionary of American Family Names.
- What are other forms of the name Janusz?
- In the etymology graph, John, Juan and Ivan are forms of the same name in other languages; Janek is a recorded short or pet form.
- Is Janusz a male or female name?
- Janusz is a male name in our records. Opposite-gender entries fall within the cross-gender noise we measure in the source data, so we don't report them as usage.
- In which country does Janusz have the most bearers?
- In Poland, the national register counted about 173 thousand people named Janusz, more than in any other country we hold, where it is most often spelled janusz.
- Where is Janusz most common?
- Janusz is densest in Poland, where the national register counts about 1 in 221 people carrying it.
- How common is the name Janusz?
- In Poland, the national register counted 173,146 people named Janusz in 2026, about 1 in 221 residents.
- How common is Janusz compared with other names?
- In Poland, Janusz is the 51st most common given name of 25,969 given names recorded there.
What do you want to know about Janusz?
Nobody replies to these one by one, but what readers ask decides what these pages answer next.
Query this name via API
curl -H "X-API-Key: YOUR_KEY" https://api.mondonomo.ai/api/v1/name-graph/januszThe payload this page is built from: spellings and scripts, countries and languages, related names, and the registers that attest the form. It takes a free API key (1,000 requests a day), which returns what this page shows everyone; the full country table, every register citation and the year-by-year series come with a licensed key, as does bulk access.
About this data
measured from records inferred from the name graph machine-generated
These figures come from the data snapshot of and will change as it is rebuilt.
Statistics are aggregated from the Mondonomo name corpus; related names and etymology are inferred from the name graph; pronunciation and any machine-marked transliterations are model-generated. Read how the numbers are made, including their known failure modes, and where the data comes from.
Reference works we consult — surname dictionaries, official name registers, Wikidata and Wiktionary — are named directly, beside the claims they support. The per-country source counts also include datasets of person records: we publish how many there are and their authority tier, but not their names.
Cite this page Mondonomo, “Janusz” — the 51st most common given name in Poland. Data snapshot 2026-10-10.