Estimate the nationality of a first name.
Nationalize.io API is a free Development API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
Find the nationality of a last name. Use our API, process spreadsheets or utilize through third-party tools.
Details from nationalize.io.

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Yes. The Nationalize.io API is listed in the Development category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The Nationalize.io API requires no authentication, so you can start making requests without signing up.
Yes. The Nationalize.io API supports CORS, so front-end JavaScript can call it directly.
Yes. The Nationalize.io API is served over HTTPS, so it's safe to use in production.