We can start with these: [English](https://en.wikipedia.org/wiki/ISO_639:eng) [Mandarin Chinese](https://en.wikipedia.org/wiki/ISO_639:cmn) [Hindi](https://en.wikipedia.org/wiki/ISO_639:hin) [Spanish](https://en.wikipedia.org/wiki/ISO_639:spa) [Modern Standard Arabic](https://en.wikipedia.org/wiki/ISO_639:arb) [French](https://en.wikipedia.org/wiki/ISO_639:fra) [Bengali](https://en.wikipedia.org/wiki/ISO_639:ben) [Portuguese](https://en.wikipedia.org/wiki/ISO_639:por) [Standard German](https://en.wikipedia.org/wiki/ISO_639:deu) [Japanese](https://en.wikipedia.org/wiki/ISO_639:jpn) [Korean](https://en.wikipedia.org/wiki/ISO_639:kor) [Italian](https://en.wikipedia.org/wiki/ISO_639:ita) https://en.wikipedia.org/wiki/List_of_languages_by_total_number_of_speakers
