---
license: other
license_name: mixed-source
license_details: each source keeps its own terms; see the table
pretty_name: usernames
size_categories:
- 100M<n<1B
task_categories:
- text-generation
tags:
- usernames
- names
configs:
- config_name: corpus
  default: true
  data_files:
  - split: train
    path: prep/names.parquet
- config_name: xato
  data_files:
  - split: train
    path: sources/xato.parquet
- config_name: bsky
  data_files:
  - split: train
    path: sources/bsky.parquet
- config_name: stack
  data_files:
  - split: train
    path: sources/stack.parquet
- config_name: hn
  data_files:
  - split: train
    path: sources/hn.parquet
- config_name: reddit
  data_files:
  - split: train
    path: sources/reddit.parquet
- config_name: urls
  data_files:
  - split: train
    path: sources/urls.parquet
- config_name: roblox
  data_files:
  - split: train
    path: sources/roblox.parquet
- config_name: crates
  data_files:
  - split: train
    path: sources/crates.parquet
- config_name: kaggle
  data_files:
  - split: train
    path: sources/kaggle.parquet
- config_name: gharchive
  data_files:
  - split: train
    path: sources/gharchive.parquet
- config_name: codeforces
  data_files:
  - split: train
    path: sources/codeforces.parquet
- config_name: lichess
  data_files:
  - split: train
    path: sources/lichess.parquet
- config_name: jeanphorn
  data_files:
  - split: train
    path: sources/jeanphorn.parquet
- config_name: so
  data_files:
  - split: train
    path: sources/so.parquet
- config_name: se
  data_files:
  - split: train
    path: sources/se.parquet
- config_name: osm
  data_files:
  - split: train
    path: sources/osm.parquet
- config_name: enwiki
  data_files:
  - split: train
    path: sources/enwiki.parquet
- config_name: ssa
  data_files:
  - split: train
    path: sources/ssa.parquet
- config_name: wikis
  data_files:
  - split: train
    path: sources/wikis.parquet
- config_name: sentiment140
  data_files:
  - split: train
    path: sources/sentiment140.parquet
- config_name: urls_full
  data_files:
  - split: train
    path: sources/urls_full.parquet
- config_name: atlas
  data_files:
  - split: train
    path: sources/atlas.parquet
- config_name: labels-judge-generic3-1m
  data_files:
  - split: train
    path: labels/judge-generic3-1m.parquet
- config_name: labels-judge-generic3-targeted-864k
  data_files:
  - split: train
    path: labels/judge-generic3-targeted-864k.parquet
- config_name: labels-judge-samples-2026-09-19
  data_files:
  - split: train
    path: labels/judge-samples-2026-09-19.parquet
---

# usernames

149,142,110 unique login-style usernames (1,713 MB of bytes) collected from
public sources, filtered to `[A-Za-z0-9._-]{3,64}` with case kept, deduplicated exactly, and split
by `xxh3_64(name) % 64 == 0` into 2,328,816 held-out and 146,813,294 training names.

## Files

- `prep/names.parquet`: every kept name with `src` (index of the source that first mentioned it, in the
  table order below), `h` (xxh3_64 of the name) and `heldout`; sorted by `h`.
- `prep/train.bin`, `prep/heldout.bin`: the same names in the same order, each followed by a zero byte
  (`<eos>`), ready to memory-map for byte-level training.
- `prep/card.json`: per-source counts, overlap between sources, length histogram, most frequent shapes.
- `sources/<id>.parquet`: the names extracted from each source before cross-source dedup, one `name` column, sorted by name.
- `prep/names.parquet`: the whole corpus, sorted by name: `name`, `source` (the owning source), `heldout`.

## Curation

The corpus is curated: `training.curate` scores every name with a classifier fine-tuned from the
teacher model on the judge labels below (expected quality 1–5, expected offensiveness 0–4,
P(offensive ≥ 3)), and `training.prep --curated` keeps each name with probability
(quality ramp 2.5 → 3.5) × (offensiveness flat to 0.1, ramp to 0 at 1.0),
zero when P(offensive ≥ 3) > 0.2, decided by a hash of the name. Dropped 47,979,317 names:
27,418,319 at the quality floor, 3,718,801 at the offensiveness ceiling, 16,962,271 by the ramps' draw.

## Labels

- `labels/<set>.parquet`: names scored by an LLM judge (`training.judge --label`): `q` is signup-form
  quality 1 (keyboard mash, ids) to 5 (a name a person clearly chose), `o` is offensiveness 0 (fine),
  1 (edgy), 2 (crude), 3 (explicit or harassing), 4 (hateful or violent); a hash-strided sample of the
  corpus named after it. These train the curation classifier (`training.curate`).

## Sources

| id | what | raw | kept |
|---|---|---|---|
| xato | SecLists xato-net-10-million-usernames.txt, frequency-sorted | 8,117,692 | 6,317,784 |
| bsky | every Bluesky account's handle, first label, from plc.directory | 44,847,753 | 34,729,153 |
| stack | GitHub usernames keyed in bigcode/the-stack-username-to-repo | 5,662,743 | 4,849,770 |
| hn | Hacker News `by` from OpenPipe/hacker-news | 617,993 | 484,921 |
| reddit | Reddit comment authors, author column read over HTTP | 13,930,423 | 10,772,830 |
| urls | account segments of profile URLs in ks46/urls-sampled shards | 471,414 | 390,827 |
| roblox | Roblox usernames labelled normal | 21,771 | 16,829 |
| crates | crates.io users' GitHub logins from the database dump | 61,307 | 50,995 |
| kaggle | Meta Kaggle UserName; needs the landed Users.csv | 30,213,080 | 26,729,645 |
| gharchive | GH Archive hourly events since 2026-01-01: actor logins and repo owners | 17,924,156 | 15,134,080 |
| codeforces | codeforces.com user.ratedList, every rated handle | 710,392 | 598,539 |
| lichess | one month of Lichess rated games: White and Black players | 1,737,598 | 1,507,796 |
| jeanphorn | jeanphorn/wordlist usernames.txt | 14,647 | 12,361 |
| so | Stack Overflow Users.xml display names | 3,814,430 | 2,814,763 |
| se | every other Stack Exchange site's Users.xml display names | 807,427 | 652,456 |
| osm | OpenStreetMap changeset user names | 1,298,150 | 1,088,543 |
| enwiki | English Wikipedia contributor usernames, last revision per page | 1,904,623 | 1,672,396 |
| ssa | US Social Security first names 1880-2018, yob*.txt | 42,329 | 41,950 |
| wikis | contributor usernames of 15 large non-English wikis and Commons | 1,127,276 | 896,302 |
| sentiment140 | Twitter handles in the Sentiment140 tweets | 511,656 | 452,865 |
| urls_full | profile handles of 980 hosts from the sorted ks46/urls dataset | 41,828,518 | 23,180,585 |
| atlas | profile handles of the same hosts from ks48/url-atlas's Common Crawl configs, newest first (partial: still being extracted) | 21,456,049 | 16,746,720 |

`raw` is the count after the filter within the source; `kept` is after cross-source dedup, where the
first source in this order owns a name. Stack Exchange display names of the form `user1234567` are dropped.