🌍 How Rare Are You in the UK?
🇬🇧 Genetic Landscape of UK
The United Kingdom has a remarkably high frequency of light-colored eyes and fair features compared to global averages, reflecting its Northern European genetic heritage. Celtic, Anglo-Saxon, Viking, and Norman ancestry combine to create a population where blue eyes are actually MORE common than brown. Scotland and Ireland have the world's highest rates of red hair (~13%), while England shows more Continental European influence. Recent centuries of immigration from South Asia, the Caribbean, and Africa have added significant diversity, particularly in urban areas like London, Birmingham, and Manchester.
Rarity in these islands tends to concentrate at the edges. The far north and west — the Outer Hebrides, Orkney, Shetland, west Wales and Cornwall — held onto languages, names and populations that the English-speaking lowlands shed centuries ago, largely because sea and hills made movement slow and expensive. Shetland spoke Norn, a Norse language, into the eighteenth century. Manx and Cornish both died out as everyday speech and were then deliberately revived from written records. Scottish Gaelic survives as a community language mainly on Lewis, Harris and the smaller Hebridean islands. Mainland Britain has been mixing since the railways arrived, and what is left of its old county distinctiveness is mostly audible: accents can still shift noticeably across a few dozen miles.
🗺️ One Country, Three Censuses, Two Census Years
There is no single UK census. The Office for National Statistics states plainly, “We are responsible for the census in England and Wales”, and it counted them on 21 March 2021: 59,597,300 usual residents, 56,489,800 in England and 3,107,500 in Wales. Northern Ireland is counted separately, by the Northern Ireland Statistics and Research Agency, which runs “the decennial Census of Population and Housing in Northern Ireland”. Scotland’s most recent census was held in 2022, a year later.
So a “UK” figure is an assembly of separate counts, taken in different years. Scotland’s records are kept by National Records of Scotland, whose stated job is to “collect, preserve and publish information about Scotland’s people and history”. The current UK-wide population number is an estimate rather than a count: the ONS puts it at a provisional 69,487,000 for mid-2025, released on 27 November 2025. That is worth knowing before reading any national percentage — see Data Sources.
👁️ Eye Color
| Blue | 48% |
| Green | 15% |
| Hazel | 12% |
| Brown | 22% |
| Gray | 3% |
💇 Hair Color
| Brown | 35% |
| Blonde | 25% |
| Black | 20% |
| Red | 6% |
| Other | 14% |
🩸 Blood Type
| O+ | 37% |
| A+ | 35% |
| B+ | 8% |
| O- | 7% |
| A- | 7% |
| AB+ | 3% |
| B- | 2% |
| AB- | 1% |
Trait frequencies on this page come from public and institutional datasets — see Data Sources.
🧮 Calculate Your Rarity in the UK
Pick your eye colour, hair colour and blood type. The calculator uses the UK'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 →
📅 The Eleven Days Britain Deleted
Britain’s calendar has a hole in it. The Calendar (New Style) Act 1750 is still readable on legislation.gov.uk. Section 1 orders that “the old supputation of the year not to be made use of after Dec. 1751”, that the year “commence for the future on 1 Jan.”, and that the days run as normal “until 2d Sept. 1752; and the day following to be accounted 14 Sept. omitting 11 days”. Nobody in Britain has a birthday between 3 and 13 September 1752, because those dates were never lived through.
The same Act set the leap-year rule still in use: section 2 makes “hundredth years, except every fourth hundred” common years of 365 days, with “years bissextile of 366 days”. Section 3 moved Easter and the other moveable feasts onto the new tables. So a British date recorded before September 1752 is not the same date your phone would give it. See how rare your birthday is.
🔤 No Approved-Names List, and No Sign-Off
Some countries keep a register of approved given names. The UK does the reverse. Government guidance says that “if you’re 16 or over, you can make a deed poll yourself and start using a new name” — an unenrolled deed poll, with no official sign-off at any stage. The written limits are short: the name must be “pronounceable”, must “not include symbols, numbers or punctuation (unless it’s a hyphenated name or part of an established name like O’Hara)”, and must “not be offensive or against the public interest”.
From 18 you can pay to enrol the change with the High Court, which puts it “on public record”, but that is optional and costs £53.05. Two things a deed poll cannot do: “change which letters are capitalised in your name”, and “change titles, for example Mr, Mrs, Sir, Lady or Doctor”. So the pool of legal British names is open-ended: there is no official list to be rare against.
⭐ Rare Facts About UK
Where these UK numbers come from
Institutional numbers here: population from the Office for National Statistics — the mid-2025 UK estimate of 69,487,000, released 27 November 2025 — and Census 2021, taken on 21 March 2021 in England and Wales. The blood group shares published by NHS Blood and Transplant are proportions of its donors, not a population survey. The eye and hair colour tables are estimates from non-official sources, not official counts. Last checked: September 2026.