Read docs Updated 2026-06-17
What is Nationalize.io?
Nationalize.io is a lightweight web service that accepts a first name and returns a list of likely nationalities with associated probability scores.
Developers integrate it into applications needing demographic inference, audience analysis, or personalized user experiences based on name origins.
What you can build with Nationalize.io
User Demographics Analysis
Integrate into analytics dashboards to estimate likely nationalities of users from first names for market segmentation and reporting.
Personalized Onboarding Flows
Adjust greetings, language suggestions or regional defaults in apps by estimating nationality from a user's provided first name at signup.
Data Enrichment Pipelines
Batch-process customer lists to append probable country probabilities to CRM records for improved targeting and lead scoring.
Get started with Nationalize.io
- 1Visit nationalize.io and read the endpoint documentation
- 2Build a GET request to https://api.nationalize.io with the name query parameter
- 3Optionally add country_id to restrict results to specific countries
- 4Parse the JSON response containing country probability scores
- 5Add basic error handling for invalid names and rate-limit responses
Nationalize.io: pros & cons
Pros
- +No authentication required
- +Simple REST interface with fast responses
- +Returns probability distribution across multiple countries
- +Free for moderate usage volumes
Cons
- –Accuracy depends heavily on name popularity and training data coverage
- –Only uses first name, ignoring surname or context
- –Subject to rate limits on the free tier
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Frequently asked questions
A free API that estimates the most probable nationalities for a given first name using aggregated demographic statistics.
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