JSON list of languages objects named with their ISO 639-1 Alpha-2 code. From: https://gist.github.com/jrnk/8eb57b065ea0b098d571?permalink_comment_id=4539327#gistcomment-4539327

iso-639-1-languages.json

{
  "ab": {"name": "Abkhaz", "nativeName": "аҧсуа"},
  "aa": {"name": "Afar", "nativeName": "Afaraf"},
  "af": {"name": "Afrikaans", "nativeName": "Afrikaans"},
  "ak": {"name": "Akan", "nativeName": "Akan"},
  "sq": {"name": "Albanian", "nativeName": "Shqip"},
  "am": {"name": "Amharic", "nativeName": "አማርኛ"},
  "ar": {"name": "Arabic", "nativeName": "العربية"},
  "an": {"name": "Aragonese", "nativeName": "Aragonés"},
  "hy": {"name": "Armenian", "nativeName": "Հայերեն"},
  "as": {"name": "Assamese", "nativeName": "অসমীয়া"},
  "av": {"name": "Avaric", "nativeName": "авар мацӀ, магӀарул мацӀ"},
  "ae": {"name": "Avestan", "nativeName": "avesta"},
  "ay": {"name": "Aymara", "nativeName": "aymar aru"},
  "az": {"name": "Azerbaijani", "nativeName": "azərbaycan dili"},
  "bm": {"name": "Bambara", "nativeName": "bamanankan"},
  "ba": {"name": "Bashkir", "nativeName": "башҡорт теле"},
  "eu": {"name": "Basque", "nativeName": "euskara, euskera"},
  "be": {"name": "Belarusian", "nativeName": "Беларуская"},
  "bn": {"name": "Bengali", "nativeName": "বাংলা"},
  "bh": {"name": "Bihari", "nativeName": "भोजपुरी"},
  "bi": {"name": "Bislama", "nativeName": "Bislama"},
  "bs": {"name": "Bosnian", "nativeName": "bosanski jezik"},
  "br": {"name": "Breton", "nativeName": "brezhoneg"},
  "bg": {"name": "Bulgarian", "nativeName": "български език"},
  "my": {"name": "Burmese", "nativeName": "ဗမာစာ"},
  "ca": {"name": "Catalan; Valencian", "nativeName": "Català"},
  "ch": {"name": "Chamorro", "nativeName": "Chamoru"},
  "ce": {"name": "Chechen", "nativeName": "нохчийн мотт"},
  "ny": {"name": "Chichewa; Chewa; Nyanja", "nativeName": "chiCheŵa, chinyanja"},
  "zh": {"name": "Chinese", "nativeName": "中文 (Zhōngwén), 汉语, 漢語"},
  "cv": {"name": "Chuvash", "nativeName": "чӑваш чӗлхи"},
  "kw": {"name": "Cornish", "nativeName": "Kernewek"},
  "co": {"name": "Corsican", "nativeName": "corsu, lingua corsa"},
  "cr": {"name": "Cree", "nativeName": "ᓀᐦᐃᔭᐍᐏᐣ"},
  "hr": {"name": "Croatian", "nativeName": "hrvatski"},
  "cs": {"name": "Czech", "nativeName": "česky, čeština"},
  "da": {"name": "Danish", "nativeName": "dansk"},
  "dv": {"name": "Divehi; Dhivehi; Maldivian;", "nativeName": "ދިވެހި"},
  "nl": {"name": "Dutch", "nativeName": "Nederlands, Vlaams"},
  "en": {"name": "English", "nativeName": "English"},
  "eo": {"name": "Esperanto", "nativeName": "Esperanto"},
  "et": {"name": "Estonian", "nativeName": "eesti, eesti keel"},
  "ee": {"name": "Ewe", "nativeName": "Eʋegbe"},
  "fo": {"name": "Faroese", "nativeName": "føroyskt"},
  "fj": {"name": "Fijian", "nativeName": "vosa Vakaviti"},
  "fi": {"name": "Finnish", "nativeName": "suomi, suomen kieli"},
  "fr": {"name": "French", "nativeName": "français, langue française"},
  "ff": {"name": "Fula; Fulah; Pulaar; Pular", "nativeName": "Fulfulde, Pulaar, Pular"},
  "gl": {"name": "Galician", "nativeName": "Galego"},
  "ka": {"name": "Georgian", "nativeName": "ქართული"},
  "de": {"name": "German", "nativeName": "Deutsch"},
  "el": {"name": "Greek, Modern", "nativeName": "Ελληνικά"},
  "gn": {"name": "Guaraní", "nativeName": "Avañeẽ"},
  "gu": {"name": "Gujarati", "nativeName": "ગુજરાતી"},
  "ht": {"name": "Haitian; Haitian Creole", "nativeName": "Kreyòl ayisyen"},
  "ha": {"name": "Hausa", "nativeName": "Hausa, هَوُسَ"},
  "he": {"name": "Hebrew (modern)", "nativeName": "עברית"},
  "hz": {"name": "Herero", "nativeName": "Otjiherero"},
  "hi": {"name": "Hindi", "nativeName": "हिन्दी, हिंदी"},
  "ho": {"name": "Hiri Motu", "nativeName": "Hiri Motu"},
  "hu": {"name": "Hungarian", "nativeName": "Magyar"},
  "ia": {"name": "Interlingua", "nativeName": "Interlingua"},
  "id": {"name": "Indonesian", "nativeName": "Bahasa Indonesia"},
  "ie": {"name": "Interlingue", "nativeName": "Interlingue, Occidental"},
  "ga": {"name": "Irish", "nativeName": "Gaeilge"},
  "ig": {"name": "Igbo", "nativeName": "Asụsụ Igbo"},
  "ik": {"name": "Inupiaq", "nativeName": "Iñupiaq, Iñupiatun"},
  "io": {"name": "Ido", "nativeName": "Ido"},
  "is": {"name": "Icelandic", "nativeName": "Íslenska"},
  "it": {"name": "Italian", "nativeName": "Italiano"},
  "iu": {"name": "Inuktitut", "nativeName": "ᐃᓄᒃᑎᑐᑦ"},
  "ja": {"name": "Japanese", "nativeName": "日本語 (にほんご／にっぽんご)"},
  "jv": {"name": "Javanese", "nativeName": "basa Jawa"},
  "kl": {"name": "Kalaallisut, Greenlandic", "nativeName": "kalaallisut, kalaallit oqaasii"},
  "kn": {"name": "Kannada", "nativeName": "ಕನ್ನಡ"},
  "kr": {"name": "Kanuri", "nativeName": "Kanuri"},
  "ks": {"name": "Kashmiri", "nativeName": "कश्मीरी, كشميري‎"},
  "kk": {"name": "Kazakh", "nativeName": "Қазақ тілі"},
  "km": {"name": "Khmer", "nativeName": "ភាសាខ្មែរ"},
  "ki": {"name": "Kikuyu, Gikuyu", "nativeName": "Gĩkũyũ"},
  "rw": {"name": "Kinyarwanda", "nativeName": "Ikinyarwanda"},
  "ky": {"name": "Kirghiz, Kyrgyz", "nativeName": "кыргыз тили"},
  "kv": {"name": "Komi", "nativeName": "коми кыв"},
  "kg": {"name": "Kongo", "nativeName": "KiKongo"},
  "ko": {"name": "Korean", "nativeName": "한국어 (韓國語), 조선말 (朝鮮語)"},
  "ku": {"name": "Kurdish", "nativeName": "Kurdî, كوردی‎"},
  "kj": {"name": "Kwanyama, Kuanyama", "nativeName": "Kuanyama"},
  "la": {"name": "Latin", "nativeName": "latine, lingua latina"},
  "lb": {"name": "Luxembourgish, Letzeburgesch", "nativeName": "Lëtzebuergesch"},
  "lg": {"name": "Luganda", "nativeName": "Luganda"},
  "li": {"name": "Limburgish, Limburgan, Limburger", "nativeName": "Limburgs"},
  "ln": {"name": "Lingala", "nativeName": "Lingála"},
  "lo": {"name": "Lao", "nativeName": "ພາສາລາວ"},
  "lt": {"name": "Lithuanian", "nativeName": "lietuvių kalba"},
  "lu": {"name": "Luba-Katanga", "nativeName": ""},
  "lv": {"name": "Latvian", "nativeName": "latviešu valoda"},
  "gv": {"name": "Manx", "nativeName": "Gaelg, Gailck"},
  "mk": {"name": "Macedonian", "nativeName": "македонски јазик"},
  "mg": {"name": "Malagasy", "nativeName": "Malagasy fiteny"},
  "ms": {"name": "Malay", "nativeName": "bahasa Melayu, بهاس ملايو‎"},
  "ml": {"name": "Malayalam", "nativeName": "മലയാളം"},
  "mt": {"name": "Maltese", "nativeName": "Malti"},
  "mi": {"name": "Māori", "nativeName": "te reo Māori"},
  "mr": {"name": "Marathi (Marāṭhī)", "nativeName": "मराठी"},
  "mh": {"name": "Marshallese", "nativeName": "Kajin M̧ajeļ"},
  "mn": {"name": "Mongolian", "nativeName": "монгол"},
  "na": {"name": "Nauru", "nativeName": "Ekakairũ Naoero"},
  "nv": {"name": "Navajo, Navaho", "nativeName": "Diné bizaad, Dinékʼehǰí"},
  "nb": {"name": "Norwegian Bokmål", "nativeName": "Norsk bokmål"},
  "nd": {"name": "North Ndebele", "nativeName": "isiNdebele"},
  "ne": {"name": "Nepali", "nativeName": "नेपाली"},
  "ng": {"name": "Ndonga", "nativeName": "Owambo"},
  "nn": {"name": "Norwegian Nynorsk", "nativeName": "Norsk nynorsk"},
  "no": {"name": "Norwegian", "nativeName": "Norsk"},
  "ii": {"name": "Nuosu", "nativeName": "ꆈꌠ꒿ Nuosuhxop"},
  "nr": {"name": "South Ndebele", "nativeName": "isiNdebele"},
  "oc": {"name": "Occitan", "nativeName": "Occitan"},
  "oj": {"name": "Ojibwe, Ojibwa", "nativeName": "ᐊᓂᔑᓈᐯᒧᐎᓐ"},
  "cu": {"name": "Old Church Slavonic, Church Slavic, Church Slavonic, Old Bulgarian, Old Slavonic", "nativeName": "ѩзыкъ словѣньскъ"},
  "om": {"name": "Oromo", "nativeName": "Afaan Oromoo"},
  "or": {"name": "Oriya", "nativeName": "ଓଡ଼ିଆ"},
  "os": {"name": "Ossetian, Ossetic", "nativeName": "ирон æвзаг"},
  "pa": {"name": "Panjabi, Punjabi", "nativeName": "ਪੰਜਾਬੀ, پنجابی‎"},
  "pi": {"name": "Pāli", "nativeName": "पाऴि"},
  "fa": {"name": "Persian", "nativeName": "فارسی"},
  "pl": {"name": "Polish", "nativeName": "polski"},
  "ps": {"name": "Pashto, Pushto", "nativeName": "پښتو"},
  "pt": {"name": "Portuguese", "nativeName": "Português"},
  "qu": {"name": "Quechua", "nativeName": "Runa Simi, Kichwa"},
  "rm": {"name": "Romansh", "nativeName": "rumantsch grischun"},
  "rn": {"name": "Kirundi", "nativeName": "kiRundi"},
  "ro": {"name": "Romanian, Moldavian, Moldovan", "nativeName": "română"},
  "ru": {"name": "Russian", "nativeName": "русский язык"},
  "sa": {"name": "Sanskrit (Saṁskṛta)", "nativeName": "संस्कृतम्"},
  "sc": {"name": "Sardinian", "nativeName": "sardu"},
  "sd": {"name": "Sindhi", "nativeName": "सिन्धी, سنڌي، سندھی‎"},
  "se": {"name": "Northern Sami", "nativeName": "Davvisámegiella"},
  "sm": {"name": "Samoan", "nativeName": "gagana faa Samoa"},
  "sg": {"name": "Sango", "nativeName": "yângâ tî sängö"},
  "sr": {"name": "Serbian", "nativeName": "српски језик"},
  "gd": {"name": "Scottish Gaelic; Gaelic", "nativeName": "Gàidhlig"},
  "sn": {"name": "Shona", "nativeName": "chiShona"},
  "si": {"name": "Sinhala, Sinhalese", "nativeName": "සිංහල"},
  "sk": {"name": "Slovak", "nativeName": "slovenčina"},
  "sl": {"name": "Slovene", "nativeName": "slovenščina"},
  "so": {"name": "Somali", "nativeName": "Soomaaliga, af Soomaali"},
  "st": {"name": "Southern Sotho", "nativeName": "Sesotho"},
  "es": {"name": "Spanish; Castilian", "nativeName": "español, castellano"},
  "su": {"name": "Sundanese", "nativeName": "Basa Sunda"},
  "sw": {"name": "Swahili", "nativeName": "Kiswahili"},
  "ss": {"name": "Swati", "nativeName": "SiSwati"},
  "sv": {"name": "Swedish", "nativeName": "svenska"},
  "ta": {"name": "Tamil", "nativeName": "தமிழ்"},
  "te": {"name": "Telugu", "nativeName": "తెలుగు"},
  "tg": {"name": "Tajik", "nativeName": "тоҷикӣ, toğikī, تاجیکی‎"},
  "th": {"name": "Thai", "nativeName": "ไทย"},
  "ti": {"name": "Tigrinya", "nativeName": "ትግርኛ"},
  "bo": {"name": "Tibetan Standard, Tibetan, Central", "nativeName": "བོད་ཡིག"},
  "tk": {"name": "Turkmen", "nativeName": "Türkmen, Түркмен"},
  "tl": {"name": "Tagalog", "nativeName": "Wikang Tagalog, ᜏᜒᜃᜅ᜔ ᜆᜄᜎᜓᜄ᜔"},
  "tn": {"name": "Tswana", "nativeName": "Setswana"},
  "to": {"name": "Tonga (Tonga Islands)", "nativeName": "faka Tonga"},
  "tr": {"name": "Turkish", "nativeName": "Türkçe"},
  "ts": {"name": "Tsonga", "nativeName": "Xitsonga"},
  "tt": {"name": "Tatar", "nativeName": "татарча, tatarça, تاتارچا‎"},
  "tw": {"name": "Twi", "nativeName": "Twi"},
  "ty": {"name": "Tahitian", "nativeName": "Reo Tahiti"},
  "ug": {"name": "Uighur, Uyghur", "nativeName": "Uyƣurqə, ئۇيغۇرچە‎"},
  "uk": {"name": "Ukrainian", "nativeName": "українська"},
  "ur": {"name": "Urdu", "nativeName": "اردو"},
  "uz": {"name": "Uzbek", "nativeName": "zbek, Ўзбек, أۇزبېك‎"},
  "ve": {"name": "Venda", "nativeName": "Tshivenḓa"},
  "vi": {"name": "Vietnamese", "nativeName": "Tiếng Việt"},
  "vo": {"name": "Volapük", "nativeName": "Volapük"},
  "wa": {"name": "Walloon", "nativeName": "Walon"},
  "cy": {"name": "Welsh", "nativeName": "Cymraeg"},
  "wo": {"name": "Wolof", "nativeName": "Wollof"},
  "fy": {"name": "Western Frisian", "nativeName": "Frysk"},
  "xh": {"name": "Xhosa", "nativeName": "isiXhosa"},
  "yi": {"name": "Yiddish", "nativeName": "ייִדיש"},
  "yo": {"name": "Yoruba", "nativeName": "Yorùbá"},
  "za": {"name": "Zhuang, Chuang", "nativeName": "Saɯ cueŋƅ, Saw cuengh"}
}