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Radu

Radu. Attested in Spain, United States of America, Belgium, France, Italy, Poland, Denmark, Ireland, borne by about 5,591 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.

Radue

Only sounds alike

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

RadRadaRaddRadeRadiRadyRadóRadau

What Wikidata says this name is

Copied from Wikidata, not worked out here. It is crowd-sourced and wrong in places, which is why the item is linked below rather than the claim simply repeated.

  • Romanian the language of the name

    Which is not where a family is from. A Polish surname can be borne by people whose forebears never saw Poland, and often is.

  • Read about it on Wikipedia ↗ an article, with its own sources

Q16881802 on Wikidata ↗ — the item every line above came from.

It is also the name of a place

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.

  • Radau Austria pop. 318 only a phonetic neighbour, not a spelling
  • Rade Germany pop. 244 only a phonetic neighbour, not a spelling
  • Radi Italy pop. 16 only a phonetic neighbour, not a spelling
  • Rad Austria only a phonetic neighbour, not a spelling
  • Rad Spain only a phonetic neighbour, not a spelling
  • Rád Hungary only a phonetic neighbour, not a spelling

Where it is borne, and where a record names it

Attested in 8 countries: Spain, United States of America, Belgium, France, Italy, Poland, Denmark, IrelandDenmark — attested, not countedIreland — attested, not countedItaly — 20 peoplePoland — 20 peopleFrance — 43 peopleBelgium — 553 peopleUnited States of America — 954 peopleSpain — 4,001 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 8 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. 553 people in 52 of Belgium's 565 communes, counted by Statbel. The biggest is Charleroi with 64. 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.
52 places drawn, the largest being Charleroi, Brussel, Schaarbeek, Anderlecht, Antwerpen, Gent, Sint-Jans-Molenbeek, Ukkel, Jette, La LouvièreWillebroek — 5Lier — 5Mortsel — 5Boom — 5Nieuwerkerken — 6Beringen — 6Luik — 6Châtelet — 6Eigenbrakel — 6Scherpenheuvel-Zichem — 6Asse — 6Geel — 6Ecaussinnes — 7Zottegem — 7Diest — 7Wemmel — 7Sint-Lambrechts-Woluwe — 7Etterbeek — 7Turnhout — 7Floreffe — 8Tielt — 8Tubeke — 8Koekelberg — 9Ciney — 10Flémalle — 10Montigny-le-Tilleul — 10Roeselare — 10Grimbergen — 10Oostende — 12Ganshoren — 12La Louvière — 13Jette — 14Ukkel — 17Sint-Jans-Molenbeek — 17Gent — 23Antwerpen — 23Anderlecht — 24Schaarbeek — 30Brussel — 44Charleroi — 64

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.

Spain

4,001 Borne — a state counted them — Frecuencia de apellidos, Censos de población (INE).

Whose archive to write to

13,913 of 35,936 volumes held for Spain overlap the 1660s, 1820s, 1860s, 1880s, 1900s, 1940s and 1960s — the decades Radu is attested here. Too many to list, and this atlas does not know whether any one of them names Radu. The commonest kinds: Church and parish registers, Probate, land and notarial, Civil registration and vital records, Immigration and emigration. See everything this atlas holds for Spain →

United States of America

954 Borne — a state counted them — Frequently Occurring Surnames from the 2010 Census; Frequently Occurring Surnames from the 2000 Census.

Whose archive to write to

128,345 of 528,875 volumes held for United States of America overlap the 1910s, 1930s, 1940s, 1960s, 1970s, 1980s and 1990s — the decades Radu is attested here. Too many to list, and this atlas does not know whether any one of them names Radu. The commonest kinds: Probate, land and notarial, Civil registration and vital records, Immigration and emigration, Censuses and population lists. See everything this atlas holds for United States of America →

Belgium

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

Whose archive to write to

8 of 24,426 volumes held for Belgium overlap the 1990s — the decades Radu is attested here. None is known to name Radu: a volume overlapping these years is a document from the right place and time, not a confirmed match. Worth an afternoon.

France

43 Borne — a state counted them — Fichier des noms de famille 1891–2000 (INSEE, fichier national).

Whose archive to write to

75 of 1,513 volumes held for France overlap the 1810s — the decades Radu is attested here. Too many to list, and this atlas does not know whether any one of them names Radu. The commonest kinds: Civil registration and vital records, Church and parish registers, Censuses and population lists. See everything this atlas holds for France →

Italy

20 Borne — a state counted them — Italian comuni publishing their residents' surnames as open data, indexed by the national catalogue dati.gov.it..

Whose archive to write to

337,515 of 1,288,913 volumes held for Italy overlap the 1580s, 1800s, 1880s, 1910s, 1920s, 1930s, 1940s and 1980s — the decades Radu is attested here. Too many to list, and this atlas does not know whether any one of them names Radu. The commonest kinds: Civil registration and vital records, Church and parish registers. See everything this atlas holds for Italy →

Poland

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

Whose archive to write to

2,321 of 15,686 volumes held for Poland overlap the 1890s and 1990s — the decades Radu is attested here. Too many to list, and this atlas does not know whether any one of them names Radu. The commonest kinds: Church and parish registers, Civil registration and vital records, Cemeteries and burials. 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 Radu in Denmark, so it cannot narrow Denmark's 4,099 volumes by date — see Denmark's own page for all of it.

Ireland

Borne — a state counted them — Surnames of babies with ten or more occurrences, 2023–2025 (CSO, VSA110).

Whose archive to write to

This atlas has no birth-year evidence for Radu in Ireland, so it cannot narrow Ireland's 1,568 volumes by date — see Ireland's own page for all of it.

When it was being born, in France

INSEE counts births by surname and decade from the état civil, 1891 to 2000 — the only dated evidence in this dataset. A name that starts at zero and climbs arrived; a name that falls to nothing left, died out, or emigrated, and the decade it stops is the decade to stop searching. It counts births registered in France, so a family that emigrated in 1900 simply stops appearing, which is information rather than a defect.

  • 1891–1900 2
  • 1901–1910 2
  • 1911–1920 3
  • 1921–1930 4
  • 1931–1940 2
  • 1941–1950 1
  • 1951–1960 1
  • 1961–1970 —
  • 1971–1980 —
  • 1981–1990 1
  • 1991–2000 27

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
France
Italy
  • Carnia, Friuli 6 eras Patriarchate of Aquileia → Republic of Venice → Austria → Napoleonic Kingdom of Italy → …
  • Campania — Caserta and Naples 5 eras Kingdom of Naples → Napoleonic Kingdom of Naples → Kingdom of the Two Sicilies → Kingdom of Italy → …
  • Eastern Sicily — Catania 4 eras Kingdom of Sicily → Kingdom of the Two Sicilies → Kingdom of Italy → Italy
  • Calabria 4 eras Kingdom of Naples → Napoleonic Kingdom of Naples → Kingdom of the Two Sicilies → Italy
  • Carniola and the Slovene lands 8 eras Inner Austria → Austria → The Illyrian Provinces → Kingdom of Serbs, Croats and Slovenes, then Yugoslavia → …
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 → …

Regions are also drawn in 2 other countries where this name is attested, further down the register's own list. The order here is how many people a register counted, so the countries above are the ones the name most belongs to.

No record region is drawn yet for Spain — which is a gap in this atlas and not a statement about that country.

Find Radu on the map →

The surname dataset · CC0, and downloadable