Sieja
surname · Latin script
Recorded for both men and women· direction only, no split published
Sieja is a surname written in the Latin script, with more bearers in Poland than in any other country.
- PLPoland1 in 33K(measured from records)
- DKDenmark1 in 734K
- CZCzechia1 in 764K
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)
- Sources
- 74 (measured from records)
- 1 in 33K (inferred from the name graph)
1,154 people, 2026
Highest-authority source
Poland
measured from records inferred from the name graph
Meaning & origin
No verified etymology recorded for this name yet — the entries below are drawn from usage statistics and the name graph.
Sources 1
Where in the world(measured from records)
Sieja 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 | 1,154 | 1 in 33K | 595 | — | — |
| US United States | 389 | 1 in 855K | 389 | Sieja | 8 |
| CZ Czechia | 14 | 1 in 764K | 14 | — | — |
| DK Denmark | 8 | 1 in 734K | 8 | — | — |
| ES Spain | 8 | 1 in 6.3M | 8 | — | 1 |
1,154 people counted by dane.gov.pl — PESEL living persons (surnames), 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 living persons (surnames); Census Bureau — Surname Frequency 2010; MVČR — living population register 2017; Danmarks Statistik — Hvor mange hedder...? (living-population name counts); INE — Padrón per-token widgets (current living counts, given + apellidos). 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).
Evidence(measured from records)
Attested in 15 sources across 6 countries.
| Country | Register | Year | Count | Rank |
|---|---|---|---|---|
| PL Poland | dane.gov.pl — PESEL living persons (surnames) | 2026 | 595 | — |
| PL Poland | dane.gov.pl — PESEL living persons (names) | — | 595 | #5,433 |
| PL Poland | dane.gov.pl — PESEL living persons (surnames) | 2026 | 559 | — |
| PL Poland | dane.gov.pl — PESEL living persons (names) | — | 559 | #5,692 |
| US United States | Census Bureau — Surname Frequency 2010 | 2010 | 389 | #53,204 |
| US United States | Census Bureau — Surname Frequency 2020 | 2020 | 364 | #59,889 |
| US United States | Census Bureau — Surname Frequency 2000 | 2000 | 343 | #55,849 |
| CZ Czechia | MVČR — living population register 2017 | — | 14 | #65,460 |
| DK Denmark | Danmarks Statistik — Hvor mange hedder...? (living-population name counts) | — | 8 | #46,145 |
| ES Spain | INE — Padrón per-token widgets (current living counts, given + apellidos) | — | 8 | #134,434 |
| US United States | wru Name Dictionary — US surnames, Census 2010 subset (Khanna et al.) | — | — | — |
Reference works 4
- Nederlandse FamilienamenBank (Dutch surname bank; ex-Meertens Instituut, now CBG)2007
- 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
- In which country does Sieja have the most bearers?
- In Poland, the national register counted about 1.2 thousand people named Sieja, more than in any other country we hold.
- Where is Sieja most common?
- Sieja is densest in Poland, where the national register counts about 1 in 33 thousand people carrying it.
- How common is the name Sieja?
- In Poland, the national register counted 1,154 people named Sieja in 2026, about 1 in 33 thousand residents.
What do you want to know about Sieja?
Nobody replies to these one by one, but what readers ask decides what these pages answer next.
Query this name via API
curl https://api.mondonomo.ai/api/v1/name-graph/siejaThe same payload this page is built from: spellings and scripts, countries and languages, related names, and the registers that attest the form. Rate-limited for casual use; a free API key gives 1,000 requests a day, and bulk access is licensed separately.
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, “Sieja”. Data snapshot 2026-10-10.