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I am looking for where the locale name declared in language pack?

We can see the list of language in admin or using command line

Store > Configuration > General > Locale Option

or

bin/magento info:language:list

I have searched in /var/www/html/magento2/vendor/magento/language-de_de (composer.json, language.xml, registration.php) but unable to find the exact name of the locale like listed in admin(German (Germany)).

Thanks.

you can get all language declaration list from vendor folder MagentoFrameworkLocaleConfig.php file.

you can check here from above class,

protected $_allowedLocales = [
 'af_ZA', /*Afrikaans (South Africa)*/
 'ar_DZ', /*Arabic (Algeria)*/
 'ar_EG', /*Arabic (Egypt)*/
 'ar_KW', /*Arabic (Kuwait)*/
 'ar_MA', /*Arabic (Morocco)*/
 'ar_SA', /*Arabic (Saudi Arabia)*/
 'az_Latn_AZ', /*Azerbaijani (Azerbaijan)*/
 'be_BY', /*Belarusian (Belarus)*/
 'bg_BG', /*Bulgarian (Bulgaria)*/
 'bn_BD', /*Bengali (Bangladesh)*/
 'bs_Latn_BA', /*Bosnian (Bosnia)*/
 'ca_ES', /*Catalan (Catalonia)*/
 'cs_CZ', /*Czech (Czech Republic)*/
 'cy_GB', /*Welsh (United Kingdom)*/
 'da_DK', /*Danish (Denmark)*/
 'de_AT', /*German (Austria)*/
 'de_CH', /*German (Switzerland)*/
 'de_DE', /*German (Germany)*/
 'el_GR', /*Greek (Greece)*/
 'en_AU', /*English (Australian)*/
 'en_CA', /*English (Canadian)*/
 'en_GB', /*English (United Kingdom)*/
 'en_NZ', /*English (New Zealand)*/
 'en_US', /*English (United States)*/
 'es_AR', /*Spanish (Argentina)*/
 'es_CO', /*Spanish (Colombia)*/
 'es_PA', /*Spanish (Panama)*/
 'gl_ES', /*Galician (Galician)*/
 'es_CR', /*Spanish (Costa Rica)*/
 'es_ES', /*Spanish (Spain)*/
 'es_MX', /*Spanish (Mexico)*/
 'eu_ES', /*Basque (Basque)*/
 'es_PE', /*Spanish (Peru)*/
 'et_EE', /*Estonian (Estonia)*/
 'fa_IR', /*Persian (Iran)*/
 'fi_FI', /*Finnish (Finland)*/
 'fil_PH', /*Filipino (Philippines)*/
 'fr_CA', /*French (Canada)*/
 'fr_FR', /*French (France)*/
 'gu_IN', /*Gujarati (India)*/
 'he_IL', /*Hebrew (Israel)*/
 'hi_IN', /*Hindi (India)*/
 'hr_HR', /*Croatian (Croatia)*/
 'hu_HU', /*Hungarian (Hungary)*/
 'id_ID', /*Indonesian (Indonesia)*/
 'is_IS', /*Icelandic (Iceland)*/
 'it_CH', /*Italian (Switzerland)*/
 'it_IT', /*Italian (Italy)*/
 'ja_JP', /*Japanese (Japan)*/
 'ka_GE', /*Georgian (Georgia)*/
 'km_KH', /*Khmer (Cambodia)*/
 'ko_KR', /*Korean (South Korea)*/
 'lo_LA', /*Lao (Laos)*/
 'lt_LT', /*Lithuanian (Lithuania)*/
 'lv_LV', /*Latvian (Latvia)*/
 'mk_MK', /*Macedonian (Macedonia)*/
 'mn_Cyrl_MN', /*Mongolian (Mongolia)*/
 'ms_Latn_MY', /*Malaysian (Malaysia)*/
 'nl_NL', /*Dutch (Netherlands)*/
 'nb_NO', /*Norwegian BokmГ_l (Norway)*/
 'nn_NO', /*Norwegian Nynorsk (Norway)*/
 'pl_PL', /*Polish (Poland)*/
 'pt_BR', /*Portuguese (Brazil)*/
 'pt_PT', /*Portuguese (Portugal)*/
 'ro_RO', /*Romanian (Romania)*/
 'ru_RU', /*Russian (Russia)*/
 'sk_SK', /*Slovak (Slovakia)*/
 'sl_SI', /*Slovenian (Slovenia)*/
 'sq_AL', /*Albanian (Albania)*/
 'sr_Cyrl_RS', /*Serbian (Serbia)*/
 'sv_SE', /*Swedish (Sweden)*/
 'sw_KE', /*Swahili (Kenya)*/
 'th_TH', /*Thai (Thailand)*/
 'tr_TR', /*Turkish (Turkey)*/
 'uk_UA', /*Ukrainian (Ukraine)*/
 'vi_VN', /*Vietnamese (Vietnam)*/
 'zh_Hans_CN', /*Chinese (China)*/
 'zh_Hant_HK', /*Chinese (Hong Kong SAR)*/
 'zh_Hant_TW', /*Chinese (Taiwan)*/
 'es_CL', /*Spanich (Chile)*/
 'lo_LA', /*Laotian*/
 'es_VE', /*Spanish (Venezuela)*/
 'en_IE', /*English (Ireland)*/
 ];