Czech Namedays Calendar
Lookup for a name and returns nameday date
Fastest and most advanced public holiday and observance service on the market.
Festivo Public Holidays API is a free Calendar API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.

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Lookup for a name and returns nameday date
Catholic liturgical calendar
Yes. The Festivo Public Holidays API is listed in the Calendar 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.
Yes. The Festivo Public Holidays API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The Festivo Public Holidays API supports CORS, so front-end JavaScript can call it directly.
Yes. The Festivo Public Holidays API is served over HTTPS, so it's safe to use in production.