Kostjuk
surname · Latin script
(measured from records)Officially recorded in 2 countries
Kostjuk is a surname written in the Latin script, with more bearers in Ukraine than in any other country, where it is the 61st most common surname.
- UAUkraine≈1 in 1.4Kas Костюк(inferred from the name graph)
- BYBelarus≈1 in 4.7Kas Костюк
- RURussia≈1 in 11Kas Костюк
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 Kostjuk 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.
- Ukraine (inferred from the name graph)
- 2 (measured from records)
- Record sources
- 143 (measured from records)
- ≈1 in 20K (inferred from the name graph)
≈28,000 named Костюк, est.
recorded for this name
corpus datasets behind its best-documented spelling
strongest: highest-authority source
Estonia, est.
measured from records inferred from the name graph
Spellings & scripts
(measured from records)Locally spelled Костюк in UA Ukraine, RU Russia, KZ Kazakhstan and 1 more and Kostiuk in PL Poland, EE Estonia.
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 7 languages in the etymology graph.
Where the surname Kostjuk is found
(measured from records)Kostjuk 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 | ||||
|---|---|---|---|---|---|---|
| UA Ukraine | #61 | ≈28,000 est. | ≈1 in 1.4K | — | Костюк | 61 |
| RU Russia | — | ≈13,000 est. | ≈1 in 11K | — | Костюк | 143 |
| PL Poland | — | 3,226as Kostiuk | 1 in 12K | 1.7K | Kostiuk | 35 |
| BY Belarus | #286 | ≈1,900 est. | ≈1 in 4.7K | — | Костюк | 20 |
| KZ Kazakhstan | — | ≈830 est. | ≈1 in 25K | 404 | Костюк | 34 |
| EE Estonia | — | ≈70 est. | ≈1 in 20K | 33 | Kostiuk | 3 |
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: 2021 National Population Census — popular surnames of Russians, by region of residence; dane.gov.pl — PESEL living persons (surnames); Statistics Estonia — per-name Population Register counts (nimed). 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)- Platon Kostyukb. 1924UAnot in their usual nameUkrainian biologist (1924-2010)
- Denys Kostyukb. 1982UAnot in their usual nameUkrainian road bicycle racer
- Marta Kostyukb. 2002UAnot in their usual nameUkrainian tennis player (born 2002)
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)5 registers and reference works attest this spelling, across 2 countries.
Register rows as of the 2026-10-09 data build.
Frequently asked questions
- Which countries have the most people with the surname Kostjuk?
- Mondonomo estimates about 28 thousand people named Костюк in Ukraine, more than in any other country we hold. After it come Russia, Poland, Belarus and Kazakhstan; the country table on this page ranks them.
- How common is the name Kostjuk?
- In Poland, the national register counted 3,226 people named Kostiuk in 2026, about 1 in 12 thousand residents.
- How common is Kostjuk compared with other names?
- In Ukraine, Kostjuk is the 61st most common surname of 1,177,784 surnames recorded there.
What do you want to know about Kostjuk?
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/kostjukThe 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, “Kostjuk” — the 61st most common surname in Ukraine. Data snapshot 2026-10-13.