Klejn
surname · Latin script
Meaning: tiny, delicate (of a person)
(measured from records)Officially recorded in 3 countries · latest register: dane.gov.pl, 2026
/klɛjn/(machine-generated) Polish · model-generated
Klejn is a surname written in the Latin script, with more bearers in the United States than in any other country.
- NLNetherlands1 in 2.2Kas Klein(measured from records)
- USUnited States1 in 4.1Kas Klein
- SKSlovakia1 in 4.3Kas Klein
carrying the name, as counted by its national register where one exists and as Mondonomo estimates it elsewhere (marked ≈ and "est." on hover). Where a country counts another spelling of the name rather than Klejn itself, the figure is that spelling’s, and it is named. Countries with no figure are shown too: flat where a national register lists the name without counting it, hatched where only our records hold it. One hue, darker where it is more common; hover a country for its figure.
- United States (measured from records)
- 2 (measured from records)
- Record sources
- 130 (measured from records)
- 1 in 2.2K (inferred from the name graph)
81,471 named Klein, 2010
recorded for this name
corpus datasets behind its best-documented spelling
strongest: highest-authority source
Netherlands, as Klein
measured from records inferred from the name graph
Spellings & scripts
(measured from records)Locally spelled Klein in US United States, NL Netherlands, PL Poland and 3 more.
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
(measured from records)tiny, delicate (of a person)
Cited for this meaning 1
- kaikki.org Wiktionary extract (IPA + transliterations)
Attested across 4 languages in the etymology graph.
Where in the world
(measured from records)Klejn 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 | ||||
|---|---|---|---|---|---|---|
| US United States | — | 81,471as Klein | 1 in 4.1K | 81K | Klein | 130 |
| BR Brazil | — | 27,054as Klein | 1 in 7.8K | 27K | — | 1 |
| NL Netherlands | — | 7,932as Klein | 1 in 2.2K | 7.9K | Klein | 18 |
| PL Poland | #788 | 4,546as Klein | 1 in 8.4K | 2.4K | Klein | 82 |
| AR Argentina | — | 2,884as Klein | 1 in 16K | 2.9K | — | — |
| CH Switzerland | — | 1,759as Klein | 1 in 4.8K | 1.8K | Klein | 5 |
| CZ Czechia | #179 | 1,618as Klein | 1 in 6.6K | 1.6K | Klein | 68 |
| SK Slovakia | #101 | 1,257as Klein | 1 in 4.3K | 1.3K | Klein | 64 |
81,471 people counted by Census Bureau — Surname Frequency 2010, 2010. 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: Census Bureau — Surname Frequency 2010; IBGE — Censo 2022 Nomes no Brasil per-token lookup (v3 API, given+surname); CBG Familienamenbank — Dutch surname bearer counts (GBA/BRP 2007); RENAPER — Apellidos (person counts, national); dane.gov.pl — PESEL living persons (surnames); BFS — Familiennamen der Wohnbevölkerung (surnames); MVČR — living population register 2017; JÚĽŠ SAV — Databáza priezvisk na Slovensku (surname database, 1995 census). 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).
Notable people with this name
(measured from records)- Leo Klejnb. 1927RURussian archaeologist (1927-2019)
- Zbigniew Klejnb. 1927PLPolish historian (1927-2005)
- Dorota KlejnPLPolish pharmaceutical scientist
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)Evidence
(measured from records)7 registers and reference works attest this spelling, across 3 countries.
| Country | Register | Year | Count | Rank |
|---|---|---|---|---|
| PL Poland | dane.gov.pl — PESEL living persons (surnames) | 2026 | 75 | — |
| PL Poland | dane.gov.pl — PESEL living persons (names) | — | 75 | #37,023 |
| PL Poland | dane.gov.pl — PESEL living persons (surnames) | 2026 | 71 | — |
| PL Poland | dane.gov.pl — PESEL living persons (names) | — | 71 | #39,014 |
Reference works 3
- 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 Klejn mean, and where does it come from?
- tiny, delicate (of a person) Recorded by kaikki.org Wiktionary extract (IPA + transliterations).
- How do you pronounce Klejn?
- In Polish /klɛjn/. Transcriptions are machine-generated except where a dictionary is named.
- In which country does Klejn have the most bearers?
- In the United States, the national register counted about 81 thousand people named Klein, more than in any other country we hold.
- Where is Klejn most common?
- No national register we hold counts the spelling Klejn itself. The densest figure for its family of spellings is Netherlands's: the national register counts about 1 in 2.2 thousand people named Klein.
- How common is the name Klejn?
- In the United States, the national register counted 81,471 people named Klein in 2010, about 1 in 4.1 thousand residents.
- How common is Klejn compared with other names?
- In Slovakia, Klejn is the 101st most common surname of 69,668 surnames recorded there.
What do you want to know about Klejn?
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/klejnThe 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, “Klejn” — the 101st most common surname in Slovakia. Data snapshot 2026-10-13.