Maciej
given name · Latin script
Meaning: a male given name, equivalent to English Matthias
A male name· listed as male by the registers that count names by sex
(measured from records)Officially recorded in 23 countries · latest register: dane.gov.pl, 2026
/mat͡ɕɛj/(machine-generated) pronunciation, model-generated
Maciej is a male given name written in the Latin script, with more bearers in Poland than in any other country, where it is the 33rd most common given name.
- PLPoland1 in 143(measured from records)
- GBUnited Kingdom≈1 in 21K
- USUnited States1 in 160K
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)
- Record sources
- 272 (measured from records)
- 1 in 143 (inferred from the name graph)
267,060 people, 2026
corpus datasets behind its best-documented spelling
strongest: highest-authority source
Poland
measured from records inferred from the name graph
Meaning & origin
(measured from records)a male given name, equivalent to English Matthias
Cited for this meaning 1
- kaikki.org Wiktionary extract (IPA + transliterations)
Attested across 14 languages in the etymology graph.
Where in the world
(measured from records)Maciej 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 | #33 | 267,060 | 1 in 143 | 267K | Maciej | 242 |
| GB United Kingdom | — | ≈3,100 est. | ≈1 in 21K | 4 | Maciej | 146 |
| US United States | — | 2,075 | 1 in 160K | 2.1K | Maciej | 272 |
| NO Norway | #938 | 1,205 | 1 in 4.5K | 3.3K | Maciej | 47 |
| SE Sweden | — | 1,098 | 1 in 9.3K | 1.1K | Maciej | 53 |
| IE Ireland | #595 | ≈450 est. | ≈1 in 12K | — | Maciej | 54 |
| IS Iceland | — | 342 | 1 in 1K | 342 | — | — |
267,060 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; NISRA — Baby names Northern Ireland full list (1997–present); 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). 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)Maciej is also recorded in 2 other lexicons, as a different name or as an ordinary word. These are senses of the spelling, not of the name above.
In Swedish, Maciej är en polsk form av → Mattias. En känd namnbärare är den polsk-svenske journa listen och författaren Maciej Zaremba (f. 1951).
as a nameFörnamn i Sverige. Kortfattat namnlexikon
Polish form of MATTHEW . Pet form: Maciek .
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)- Matthias Corvinusb. 1443HUnot in their usual nameKing of Hungary and Bohemia, Duke of Austria (1443-1490)
- Maciej Miechowitab. 1457PLPolish academic
- Maciej Ratajb. 1884UAMarshal of the Polish Sejm
- Maciej Giertychb. 1936PLPolish politician
- Tomasz Świątekb. 1964PLnot in their usual namePolish rower
- Maciej Stuhrb. 1975PLPolish actor
- Maciej Żurawskib. 1976PLPolish footballer
- Maciej Lampeb. 1985PLPolish basketball player
- Maciej Rybusb. 1989PLPolish association football player
- Rafał Kurzawab. 1993PLnot in their usual namePolish association football player
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)A formal English salutation is built on the surname, so it needs a full name — on its own, a first name only supports the informal form.
Evidence
(measured from records)50 registers and reference works attest this spelling, across 23 countries.
Reference works 5
- Dictionary of American Family Names
- Wikipedia given-name 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 Maciej mean, and where does it come from?
- a male given name, equivalent to English Matthias Recorded by kaikki.org Wiktionary extract (IPA + transliterations).
- Is Maciej a male or female name?
- Maciej is a male name. National registers that list it by sex list it as male: Poland (dane.gov.pl), Norway (SSB), United States (Census Bureau, 2020) and Finland (DVV), among others.
- What are other forms of the name Maciej?
- In the etymology graph, Matthew, Matt and Matias are forms of the same name in other languages.
- How do you pronounce Maciej?
- A machine transcription gives /mat͡ɕɛj/ (IPA) for Polish.
- In which country does Maciej have the most bearers?
- In Poland, the national register counted about 267 thousand people named Maciej, more than in any other country we hold, where it is most often spelled maciej.
- Where is Maciej most common?
- Maciej is densest in Poland, where the national register counts about 1 in 143 people carrying it.
- How common is the name Maciej?
- In Poland, the national register counted 267,060 people named Maciej in 2026, about 1 in 143 residents.
- How common is Maciej compared with other names?
- In Poland, Maciej is the 33rd most common given name of 25,969 given names recorded there.
What do you want to know about Maciej?
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/maciejThe 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, “Maciej” — the 33rd most common given name in Poland. Data snapshot 2026-10-13.