Record Atlas
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Duku

Duku. Attested in United States of America, Belgium, Poland, Denmark, borne by about 116 people in the registers this map holds.

The same name, spelt two ways

One systematic substitution — s for z, w for v, ch for h — where BOTH spellings are independently attested surnames. Kosina and Kozina are one man in two clerks' handwriting. Stronger than sounding alike, weaker than somebody having checked.

Ducu

Only sounds alike

An algorithm's guess. Useful for casting a net, and not evidence.

DukDakuDekuDikuDokuDukaDukeDuki

It is also the name of a place

1 place drawn, the largest being DukuDuku — 8,014
Where those places are. A dot is a settlement whose name is this surname, sized by its population — not a claim that anybody of the name lives there. Phonetic neighbours are listed below but not drawn: putting a machine's guess on the ground would dress it up as geography.

This is as close to an origin as this map will go. A surname that is also a place name often came from it — and often did not: plenty are occupations or patronymics that happen to collide with a place, and plenty of places are named after a family rather than the other way round. It is a fact with a source, which is more than an etymology page offers.

  • Duku Nigeria pop. 8,014
  • Duki Pakistan pop. 6,384 only a phonetic neighbour, not a spelling
  • Duke United States of America pop. 341 only a phonetic neighbour, not a spelling
  • Duka Hungary only a phonetic neighbour, not a spelling
  • Duke Bosnia and Herz. only a phonetic neighbour, not a spelling
  • Düke Germany only a phonetic neighbour, not a spelling

Where it is borne, and where a record names it

Attested in 4 countries: United States of America, Belgium, Poland, DenmarkDenmark — attested, not countedPoland — 3 peopleBelgium — 6 peopleUnited States of America — 107 people
A dot is a country, not a place. It sits at the country's centre because a national register counts a country; nothing here says where in it these people are. A hollow ring is attested but not counted — Denmark publishes which surnames exist and not how many carry each, and a family archive finds a name without counting heads. Sizing those by a number nobody published would invent it. Blank is not absence. This draws the 4 countries where the eleven registers and eight archives behind this atlas attest the name. Most of the world has no surname register this project can read, and the ones that do and will not are listed with the reason.
Belgium, by commune. 6 people in 1 of Belgium's 565 communes, counted by Statbel. The biggest is Dour with 6. This is the only country here that can be drawn this way — every other register counts a country and stops, so a blank elsewhere is a gap in what states publish, not in the name.
1 place drawn, the largest being DourDour — 6

Country by country

Each country below can carry up to three different kinds of evidence, and none of them is the same claim. A register is a head-count — a state counted these people. A record is one document naming the surname on that ground, narrower evidence and often much older. And a volume overlapping these dates is a document from the right place and years — never a document known to name this surname. None of the three ever means the name exists in that country and nowhere else, or that it exists nowhere but here.

United States of America

107 Borne — a state counted them — Frequently Occurring Surnames from the 2010 Census.

Whose archive to write to

378,800 of 528,875 volumes held for United States of America overlap the 1720s, 1740s, 1820s, 1830s, 1850s, 1860s, 1880s, 1890s, 1910s, 1920s, 1930s, 1940s, 1950s, 1960s, 1970s, 1980s, 1990s and 2000s — the decades Duku is attested here. Too many to list, and this atlas does not know whether any one of them names Duku. The commonest kinds: Probate, land and notarial, Civil registration and vital records, Immigration and emigration, Church and parish registers. See everything this atlas holds for United States of America →

Belgium

6 Borne — a state counted them — Family names by municipality, 1 January 2026 (Statbel, TA_POP_LST_2026).

Whose archive to write to

4 of 24,426 volumes held for Belgium overlap the 2000s — the decades Duku is attested here. None is known to name Duku: a volume overlapping these years is a document from the right place and time, not a confirmed match. Worth an afternoon.

Poland

3 Borne — a state counted them — Nazwiska występujące w rejestrze PESEL (z uwzględnieniem osób zmarłych).

Whose archive to write to

2,747 of 15,686 volumes held for Poland overlap the 1910s, 1920s and 1940s — the decades Duku is attested here. Too many to list, and this atlas does not know whether any one of them names Duku. The commonest kinds: Church and parish registers, Civil registration and vital records, Cemeteries and burials, Censuses and population lists. See everything this atlas holds for Poland →

Denmark

Borne — a state counted them — Navne registreret i Danmark, January 2020 (Danmarks Statistik, republished by Digitaliseringsstyrelsen).

Whose archive to write to

This atlas has no birth-year evidence for Duku in Denmark, so it cannot narrow Denmark's 4,099 volumes by date — see Denmark's own page for all of it.

Whose archive held that ground, and when

Every surname site can tell you a name is common somewhere. This one also knows which filing system held that ground in which years — and those are the two halves of one question: my people were called this, they were there, so who has the paper, and for which century. A name in Croatia before 1881 may sit in a military series and not a county one; a name in the Netherlands before 1811 has no civil record at all, only a baptism.

This is about the ground, not about your family. A register counting a name in a country says nothing about which village. And these are the pieces of a country this atlas has drawn, which in a large one may be a corner of it — Acadia reaches into Maine and is not a statement about the United States, and Bohemia's ground crosses into Poland. Each region's own page says which ground it covers. Where a country is missing below, nothing covers it yet.

United States of America
Belgium
Poland
  • Pomerania and Danzig 7 eras Duchy of Pomerania → Swedish Pomerania in the west; Brandenburg-Prussia in the east → Prussia → German Empire → …
  • Bohemia 6 eras Kingdom of Bohemia → Austria → Czechoslovakia → Sudetenland and the Reichsprotektorat → …
  • Posen — Prussian Poland 8 eras Poland → Prussia → Duchy of Warsaw → German Empire → …
  • Galicia 6 eras Kingdom of Galicia–Volhynia → Poland → Austria → German and Soviet occupation → …
  • Moravia and Silesia 6 eras Margraviate of Moravia → Austria → Czechoslovakia → Reichsprotektorat Böhmen und Mähren → …
  • East Prussia 4 eras State of the Teutonic Order → Duchy, then Kingdom, of Prussia → German Empire → Russia in the north; Poland in the south; Lithuania at Memel
  • Silesia 6 eras Habsburg Bohemian crown lands → Prussia → German Empire → Divided → …
  • Congress Poland — the Russian partition 7 eras Russian Empire → Duchy of Warsaw → Kingdom of Poland, in personal union with Russia → Poland, restored → …
Denmark
  • Denmark 4 eras Denmark–Norway → Denmark, after the loss of Norway → Prussia, then the German Empire → Denmark

Find Duku on the map →

The surname dataset · CC0, and downloadable