[bromagosa]

I guess it needs a better training DB, it returns {"gender": null} for not-so-common names in languages other than English...

http://api.genderize.io/?name=eloi&language_id=ca

http://api.genderize.io/?name=tomeu&language_id=ca

http://api.genderize.io/?name=rigoberta&language_id=es

http://api.genderize.io/?name=presentaci%C3%B3n&language_id=...

Credit for distinguishing between names in languages, though! Joan returns female in English, but male in Catalan.