Nationalize.io

Development

api.nationalize.io

Predicts the likely nationalities of a first name: up to five country codes with probabilities and the sample count.

Runs on your machine under the source's own terms

The crw MCP on your computer calls Nationalize.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)

nationalize/predictFree, runs locally

Ranked country-code predictions with probabilities for one or more first names.

name

Licence

Do not resell API results as a standalone dataset. You may, however, incorporate predictions into your own products, services, reports, and research.

https://nationalize.io/terms

Attribution

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

Source: Nationalize.io (Demografix ApS).

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