| --- |
| 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. |
|
|
