Genderize.io

Development

api.genderize.io

Predicts gender from a first name, with the probability of the prediction and the number of samples behind it, optionally restricted to a country.

Runs on your machine under the source's own terms

The crw MCP on your computer calls Genderize.io directly. Calls cost no credits and the data does not pass through fastCRW. Install it once for Claude Code, Cursor, Codex, Windsurf, Gemini CLI or OpenCode, with your fastCRW API key in place of the placeholder:

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Capabilities (1)

genderize/predictFree, runs locally

Predicted gender, its probability and the sample count for one or more first names.

namecountry_id?

Licence

Do not resell API results as a standalone dataset.

https://genderize.io/terms

Attribution

Display this wherever you show the data. It arrives on every response as provenance.attributionText.

Source: Genderize.io (Demografix ApS).

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