Record Atlas
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Boja

Boja. Attested in Spain, Poland, Belgium, Denmark, borne by about 179 people in the registers this map holds.

The same name, inflected

A rule of the language rather than an opinion. Polish makes Kowalski and Kowalska of one surname.

Bojy

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.

Boia

Only sounds alike

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

BoaBójBøjBajaBejaBijaBoje

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.

  • Béja Tunisia pop. 61,568 only a phonetic neighbour, not a spelling
  • Baja Hungary pop. 37,714 only a phonetic neighbour, not a spelling
  • Beja Portugal pop. 34,760 only a phonetic neighbour, not a spelling
  • Boa Italy pop. 53 only a phonetic neighbour, not a spelling
  • Boa Spain only a phonetic neighbour, not a spelling

Where it is borne, and where a record names it

Attested in 4 countries: Spain, Poland, Belgium, DenmarkDenmark — attested, not countedBelgium — 12 peoplePoland — 25 peopleSpain — 142 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. 12 people in 2 of Belgium's 565 communes, counted by Statbel. The biggest is Oostende with 7. 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.
2 places drawn, the largest being Oostende, TernatTernat — 5Oostende — 7

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

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

Whose archive to write to

This atlas has no birth-year evidence for Boja in Spain, so it cannot narrow Spain's 35,936 volumes by date — see Spain's own page for all of it.

Poland

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

Whose archive to write to

This atlas has no birth-year evidence for Boja in Poland, so it cannot narrow Poland's 15,686 volumes by date — see Poland's own page for all of it.

Belgium

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

Whose archive to write to

This atlas has no birth-year evidence for Boja in Belgium, so it cannot narrow Belgium's 24,426 volumes by date — see Belgium's own page for all of it.

Denmark

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

Whose archive to write to

1,836 of 4,099 volumes held for Denmark overlap the 1830s, 1860s and 1880s — the decades Boja is attested here. Too many to list, and this atlas does not know whether any one of them names Boja. The commonest kinds: Church and parish registers, Probate, land and notarial, Civil registration and vital records, Cemeteries and burials. See everything this atlas holds for Denmark →

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.

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 → …
Belgium
Denmark
  • Denmark 4 eras Denmark–Norway → Denmark, after the loss of Norway → Prussia, then the German Empire → Denmark

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

Find Boja on the map →

The surname dataset · CC0, and downloadable