๐ How Rare Are You in Czech Republic?
๐จ๐ฟ Genetic Landscape of Czech Republic
The Czech Republic sits at the genetic heart of Central Europe โ a blend of Slavic, Celtic (Boii tribe, giving Bohemia its name), Germanic, and steppe nomadic heritage. Bohemia and Moravia show subtle but real genetic differences, with Moravia leaning slightly more Eastern European. The Czech genetic profile bridges the gap between Germanic Western Europe and Slavic Eastern Europe. Czechs have the world's highest per-capita beer consumption, though that's cultural rather than genetic.
The map of who lives where was redrawn inside two years. Until 1945 the borderlands โ the horseshoe of hills wrapping around Bohemia and running along Moravia's northern edge โ were overwhelmingly German-speaking; the postwar expulsions emptied them, and the villages were refilled with Czechs from the interior, Slovaks, Romani families from eastern Slovakia, Volhynian Czechs returning from Ukraine and, a few years later, Greek refugees from that country's civil war. Someone from Karlovy Vary or รstรญ is therefore likely to have grandparents from somewhere else entirely, while families in south Bohemia or Moravian Slovรกcko can often be followed through one parish register for centuries. How far back a family can be traced depends heavily on which side of that 1945 line it settled.
๐ณ๏ธ The Census Question a Third of People Left Blank
In the 2021 census the nationality question (nรกrodnost) was voluntary, and the Czech Statistical Office publishes how that went: 31.6% left it blank, against 25.3% in 2011. Anyone who answered could write two nationalities instead of one. Of those who answered, 83.8% put Czech, 5.0% Moravian and 0.2% Silesian. In counts, 6,033,621 gave Czech alone and 359,621 Moravian alone, while 179,721 wrote Czech and Moravian together and 59,336 Czech and Slovak. The census counted 10,524,167 people in all on 27 March 2021.
Hold on to that before you read the tables below. A Czech percentage of this kind has a denominator of about two thirds of the population, not all of it, and some people sit in two rows at once. Moravian and Silesian exist as numbers because the census counts them as categories of their own and publishes them โ and a great many other things a person might say about themselves are not categories anyone counts, so they get no number at all.
๐๏ธ Eye Color
| Blue | 38% |
| Green | 12% |
| Gray | 10% |
| Hazel | 18% |
| Brown | 22% |
๐ Hair Color
| Brown | 30% |
| Dark Brown | 25% |
| Blonde | 18% |
| Black | 12% |
| Red | 3% |
| Gray | 12% |
๐ฉธ Blood Type
| A+ | 33% |
| O+ | 30% |
| B+ | 12% |
| AB+ | 6% |
| A- | 6% |
| O- | 7% |
| B- | 3% |
| AB- | 3% |
Trait frequencies on this page come from public and institutional datasets โ see Data Sources.
🧮 Calculate Your Rarity in Czech Republic
Pick your eye colour, hair colour and blood type. The calculator uses Czech Republic's own figures from the tables above, not world averages.
This is an estimate, not a measurement. It multiplies three national frequencies as if they were independent, and they are not: eye and hair colour share pigmentation genes, so a combination that tends to run together, such as blue eyes with blonde hair, is more common than the multiplication suggests, while one that rarely does, such as blue eyes with black hair, is rarer. Blood type is independent of both. The frequencies are national averages from public datasets — see Data Sources.
That number describes the body you were born with. Fraeon, our other site, does the same arithmetic for the part you chose: the films, series, games, books, anime and manga you have actually finished. Start your log →
๐ Since 2022 the -ovรก Ending Is a Choice
Czech surnames carry grammatical gender. Section 69 of the registry act, zรกkon ฤ. 301/2000 Sb., says women's surnames are formed in accordance with the rules of Czech grammar โ which is how Novรกk becomes Novรกkovรก. Since 1 January 2022 the same section lets a woman, when her marriage is entered in the register, ask for her surname to be recorded in the male form, and lets parents entering a birth do the same for a baby girl. The Institute of the Czech Language describes that amendment as a free choice of the unfeminised form.
That ending is the counting problem. Novรกk and Novรกkovรก are the same family name and two different strings: count spellings and you split a family in half, merge them and you hide which form each person uses. Since 2022 both can sit in one household by choice. Our name rarity page meets the same problem in every language that inflects.
๐งพ No List of Approved Names โ an Expert Opinion Instead
Denmark publishes a list of approved first names, drawn up and published by its Familieretshuset under the Danish naming law. Czechia has nothing of that kind. The government's own naming guidance says only that you may choose from names that exist, and that if the registry office doubts a name exists, you have to have an expert opinion drawn up. The same page names who writes it: the Institute of the Czech Language of the Czech Academy of Sciences for names in general, with separately named specialists for Vietnamese and Mongolian names.
The statute behind it, section 62 of zรกkon ฤ. 301/2000 Sb., sets concrete bars rather than a catalogue: a mangled form of a name cannot be entered, a male person cannot be registered with a female name or the reverse, and a child cannot be given the name a living sibling with the same parents already uses. So there is nothing to look up in advance. The gate is a procedure, not a list, with an academic institute standing at it.
โญ Rare Facts About Czech Republic
What is counted here, and by whom
Population: the Czech Statistical Office puts the country at 10,897,000 on 30 September 2025. Height: the EHIS 2019 interview survey, run by รZIS ฤR with the Czech Statistical Office, gives 179 cm for men aged 15 and over. Blood groups: the NZIP portal, published by the Ministry of Health with รZIS ฤR, gives A 42%, 0 39%, B 15%, AB 4%. The eye and hair figures have no Czech institutional publisher we could find โ they are estimates from research samples and European pigmentation models, not counts. See Data Sources. Last checked September 2026.