Zajączkowski

surname · Latin script

/zajɔnt͡ʂkɔfskʲi/(machine-generated) pronunciation, model-generated

Zajączkowski is a surname written in the Latin script, with more bearers in Poland than in any other country.

rarermore common
  • USUnited States1 in 1.1M(measured from records)
  • PLPoland1 in 8.6K
  • NONorway1 in 195K

carrying the name, as counted by each country's national register. One hue, darker where it is more common; hover a country for its figure.

Poland (measured from records)

4,457 people, 2026

Sources
126 (measured from records)

Highest-authority source

1 in 8.6K (inferred from the name graph)

Poland

measured from records inferred from the name graph

Name dossier (print, CSV)

Spellings & scripts(measured from records)

One other spelling is counted as the same name:

Locally spelled Zajaczkowski in PL Poland, US United States, CH Switzerland.

Spellings marked ● are how people bearing the name write it in our records, and ○ marks a model's transliteration; click a spelling to open its page.

Meaning & origin

No verified etymology recorded for this name yet — the entries below are drawn from usage statistics and the name graph.

Attested across 10 languages in the etymology graph.

Where in the world(measured from records)

Zajączkowski 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.

Where Zajączkowski is recorded, by country
CountryMost common spellingSources
PL Poland4,4571 in 8.6K4.4KZajaczkowski3
US United States3151 in 1.1M338Zajaczkowski126
AR Argentina1011 in 450K101——
BR Brazil331 in 6.4M33——
NO Norway281 in 195K28—2
CH Switzerland131 in 646K13Zajaczkowski6
DK Denmark121 in 489K12——

4,457 people counted by dane.gov.pl — PESEL living persons (surnames), 2026, counting the spelling zajączkowski. 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 living persons (surnames); Census Bureau — Surname Frequency 2010; Census Bureau — Surname Frequency 2000; RENAPER — Apellidos (person counts, national); IBGE — Censo 2022 Nomes no Brasil per-token lookup (v3 API, given+surname); SSB — Navnesøk (name-search service, living population); BFS — Familiennamen der Wohnbevölkerung (surnames); Danmarks Statistik — Hvor mange hedder...? (living-population name counts). 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 names spelled this way(inferred from the name graph)

Zajączkowski is also recorded as 6 other names, grouped separately because the records behind them do not connect to the one described above.

  • a separate name2 spellings in the group

    Also written Zajaczkowski

  • Spanish surname6 spellings in the group

    Most recorded in Argentina, Brazil, United States, Venezuela

    Languages: Spanish, Portuguese

    Also written Zajaczkowski, Zajaczköwski, Zajaçzkowski

  • French surname3 spellings in the group

    Most recorded in France, United States, Switzerland, United Kingdom

    Also written Zajaczkowski

  • Hindi surname4 spellings in the group

    Most recorded in United States

    Also written Zajaczkowski

  • Slovak surname4 spellings in the group

    Most recorded in Slovakia

    Also written Zajaczkowski

  • Swahili surname2 spellings in the group

    Most recorded in United States

    Also written Zajaczkowski

7 further groups record this spelling and are not listed here.

Grouping is the name graph's, not a register's: two spellings join a group when the evidence links them, so a group is a claim about the records rather than about the people.

Notable people with this name(measured from records)

18001850190019502000Władysław Zajączkowski, b. 1837Witold Zajączkowski, b. 1892Vasiliy Zayonchkovskiy, b. 1897Ananiasz Zajączkowski, b. 1903Piotr Zayonchkovskiy, b. 1904Włodzimierz Zajączkowski, b. 1914Stanisław Zajączkowski, b. 1931Zhanna Zayonchkovskaya, b. 1939Christian Zajaczkowski, b. 1961Wojciech Zajączkowski, b. 1963

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).

How to address them(machine-generated)

FormalSzanowni Państwo,Dear Zajączkowski, (English)
InformalSzanowni Państwo,Hello, (English)

Evidence(measured from records)

Attested in 7 sources across 2 countries.

Official registers attesting Zajączkowski
CountryRegisterYearCountRank
PL Polanddane.gov.pl — PESEL living persons (surnames)20264.4K—
PL Polanddane.gov.pl — PESEL living persons (names)—4.4K#450
PL Polanddane.gov.pl — PESEL living persons (surnames)202624—
PL Polanddane.gov.pl — PESEL living persons (names)—24#81,670

Reference works 4

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

How do you pronounce Zajączkowski?
A machine transcription gives /zajɔnt͡ʂkɔfskʲi/ (IPA) for Polish.
In which country does Zajączkowski have the most bearers?
In Poland, the national register counted about 4.5 thousand people named Zajączkowski, more than in any other country we hold, where it is most often spelled zajaczkowski.
Where is Zajączkowski most common?
Zajączkowski is densest in Poland, where the national register counts about 1 in 8.6 thousand people carrying it.
How common is the name Zajączkowski?
In Poland, the national register counted 4,457 people named Zajączkowski in 2026, about 1 in 8.6 thousand residents.

What do you want to know about Zajączkowski?

Nobody replies to these one by one, but what readers ask decides what these pages answer next.

Please leave out anyone's personal details (see Privacy).

Query this name via API
curl -H "X-API-Key: YOUR_KEY" https://api.mondonomo.ai/api/v1/name-graph/zaj%C4%85czkowski

The 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, “Zajączkowski”. Data snapshot 2026-10-10.

See how Zajączkowski parses inside a full name →