Note: the below list:

was created based on wiki list https://en.wikipedia.org/wiki/ISO_3166-1,
uses english short names with associated Alpha-2 codes.
Country list object example:
// ONLINE-RUNNER:browser;

var Countries = new function() {

	// https://en.wikipedia.org/wiki/ISO_3166-1

	var list = [
		{code: 'af', name: 'Afghanistan'},
		{code: 'ax', name: 'Åland Islands'},
		{code: 'al', name: 'Albania'},
		{code: 'dz', name: 'Algeria'},
		{code: 'as', name: 'American Samoa'},
		{code: 'ad', name: 'Andorra'},
		{code: 'ao', name: 'Angola'},
		{code: 'ai', name: 'Anguilla'},
		{code: 'aq', name: 'Antarctica'},
		{code: 'ag', name: 'Antigua and Barbuda'},
		{code: 'ar', name: 'Argentina'},
		{code: 'am', name: 'Armenia'},
		{code: 'aw', name: 'Aruba'},
		{code: 'au', name: 'Australia'},
		{code: 'at', name: 'Austria'},
		{code: 'az', name: 'Azerbaijan'},
		{code: 'bs', name: 'Bahamas'},
		{code: 'bh', name: 'Bahrain'},
		{code: 'bd', name: 'Bangladesh'},
		{code: 'bb', name: 'Barbados'},
		{code: 'by', name: 'Belarus'},
		{code: 'be', name: 'Belgium'},
		{code: 'bz', name: 'Belize'},
		{code: 'bj', name: 'Benin'},
		{code: 'bm', name: 'Bermuda'},
		{code: 'bt', name: 'Bhutan'},
		{code: 'bo', name: 'Bolivia (Plurinational State of)'},
		{code: 'bq', name: 'Bonaire, Sint Eustatius and Saba'},
		{code: 'ba', name: 'Bosnia and Herzegovina'},
		{code: 'bw', name: 'Botswana'},
		{code: 'bv', name: 'Bouvet Island'},
		{code: 'br', name: 'Brazil'},
		{code: 'io', name: 'British Indian Ocean Territory'},
		{code: 'bn', name: 'Brunei Darussalam'},
		{code: 'bg', name: 'Bulgaria'},
		{code: 'bf', name: 'Burkina Faso'},
		{code: 'bi', name: 'Burundi'},
		{code: 'cv', name: 'Cabo Verde'},
		{code: 'kh', name: 'Cambodia'},
		{code: 'cm', name: 'Cameroon'},
		{code: 'ca', name: 'Canada'},
		{code: 'ky', name: 'Cayman Islands'},
		{code: 'cf', name: 'Central African Republic'},
		{code: 'td', name: 'Chad'},
		{code: 'cl', name: 'Chile'},
		{code: 'cn', name: 'China'},
		{code: 'cx', name: 'Christmas Island'},
		{code: 'cc', name: 'Cocos (Keeling) Islands'},
		{code: 'co', name: 'Colombia'},
		{code: 'km', name: 'Comoros'},
		{code: 'cg', name: 'Congo'},
		{code: 'cd', name: 'Congo (Democratic Republic of the)'},
		{code: 'ck', name: 'Cook Islands'},
		{code: 'cr', name: 'Costa Rica'},
		{code: 'ci', name: 'Côte d\'Ivoire'},
		{code: 'hr', name: 'Croatia'},
		{code: 'cu', name: 'Cuba'},
		{code: 'cw', name: 'Curaçao'},
		{code: 'cy', name: 'Cyprus'},
		{code: 'cz', name: 'Czech Republic'},
		{code: 'dk', name: 'Denmark'},
		{code: 'dj', name: 'Djibouti'},
		{code: 'dm', name: 'Dominica'},
		{code: 'do', name: 'Dominican Republic'},
		{code: 'ec', name: 'Ecuador'},
		{code: 'eg', name: 'Egypt'},
		{code: 'sv', name: 'El Salvador'},
		{code: 'gq', name: 'Equatorial Guinea'},
		{code: 'er', name: 'Eritrea'},
		{code: 'ee', name: 'Estonia'},
		{code: 'et', name: 'Ethiopia'},
		{code: 'fk', name: 'Falkland Islands (Malvinas)'},
		{code: 'fo', name: 'Faroe Islands'},
		{code: 'fj', name: 'Fiji (Republic of)'},
		{code: 'fi', name: 'Finland'},
		{code: 'fr', name: 'France'},
		{code: 'gf', name: 'French Guiana'},
		{code: 'pf', name: 'French Polynesia'},
		{code: 'tf', name: 'French Southern Territories'},
		{code: 'ga', name: 'Gabon'},
		{code: 'gm', name: 'Gambia'},
		{code: 'ge', name: 'Georgia'},
		{code: 'de', name: 'Germany'},
		{code: 'gh', name: 'Ghana'},
		{code: 'gi', name: 'Gibraltar'},
		{code: 'gr', name: 'Greece'},
		{code: 'gl', name: 'Greenland'},
		{code: 'gd', name: 'Grenada'},
		{code: 'gp', name: 'Guadeloupe'},
		{code: 'gu', name: 'Guam'},
		{code: 'gt', name: 'Guatemala'},
		{code: 'gg', name: 'Guernsey'},
		{code: 'gn', name: 'Guinea'},
		{code: 'gw', name: 'Guinea-Bissau'},
		{code: 'gy', name: 'Guyana'},
		{code: 'ht', name: 'Haiti'},
		{code: 'hm', name: 'Heard Island and McDonald Islands'},
		{code: 'va', name: 'Holy See'},
		{code: 'hn', name: 'Honduras'},
		{code: 'hk', name: 'Hong Kong'},
		{code: 'hu', name: 'Hungary'},
		{code: 'is', name: 'Iceland'},
		{code: 'in', name: 'India'},
		{code: 'id', name: 'Indonesia'},
		{code: 'ir', name: 'Iran (Islamic Republic of)'},
		{code: 'iq', name: 'Iraq'},
		{code: 'ie', name: 'Ireland'},
		{code: 'im', name: 'Isle of Man'},
		{code: 'il', name: 'Israel'},
		{code: 'it', name: 'Italy'},
		{code: 'jm', name: 'Jamaica'},
		{code: 'jp', name: 'Japan'},
		{code: 'je', name: 'Jersey'},
		{code: 'jo', name: 'Jordan'},
		{code: 'kz', name: 'Kazakhstan'},
		{code: 'ke', name: 'Kenya'},
		{code: 'ki', name: 'Kiribati'},
		{code: 'kp', name: 'Korea (Democratic People\'s Republic of)'},
		{code: 'kr', name: 'Korea (Republic of)'},
		{code: 'kw', name: 'Kuwait'},
		{code: 'kg', name: 'Kyrgyzstan'},
		{code: 'la', name: 'Lao People\'s Democratic Republic'},
		{code: 'lv', name: 'Latvia'},
		{code: 'lb', name: 'Lebanon'},
		{code: 'ls', name: 'Lesotho'},
		{code: 'lr', name: 'Liberia'},
		{code: 'ly', name: 'Libya'},
		{code: 'li', name: 'Liechtenstein'},
		{code: 'lt', name: 'Lithuania'},
		{code: 'lu', name: 'Luxembourg'},
		{code: 'mo', name: 'Macao'},
		{code: 'mk', name: 'Macedonia (the former Yugoslav Republic of)'},
		{code: 'mg', name: 'Madagascar'},
		{code: 'mw', name: 'Malawi'},
		{code: 'my', name: 'Malaysia'},
		{code: 'mv', name: 'Maldives'},
		{code: 'ml', name: 'Mali'},
		{code: 'mt', name: 'Malta'},
		{code: 'mh', name: 'Marshall Islands'},
		{code: 'mq', name: 'Martinique'},
		{code: 'mr', name: 'Mauritania'},
		{code: 'mu', name: 'Mauritius'},
		{code: 'yt', name: 'Mayotte'},
		{code: 'mx', name: 'Mexico'},
		{code: 'fm', name: 'Micronesia (Federated States of)'},
		{code: 'md', name: 'Moldova (Republic of)'},
		{code: 'mc', name: 'Monaco'},
		{code: 'mn', name: 'Mongolia'},
		{code: 'me', name: 'Montenegro'},
		{code: 'ms', name: 'Montserrat'},
		{code: 'ma', name: 'Morocco'},
		{code: 'mz', name: 'Mozambique'},
		{code: 'mm', name: 'Myanmar'},
		{code: 'na', name: 'Namibia'},
		{code: 'nr', name: 'Nauru'},
		{code: 'np', name: 'Nepal'},
		{code: 'nl', name: 'Netherlands'},
		{code: 'nc', name: 'New Caledonia'},
		{code: 'nz', name: 'New Zealand'},
		{code: 'ni', name: 'Nicaragua'},
		{code: 'ne', name: 'Niger'},
		{code: 'ng', name: 'Nigeria'},
		{code: 'nu', name: 'Niue'},
		{code: 'nf', name: 'Norfolk Island'},
		{code: 'mp', name: 'Northern Mariana Islands'},
		{code: 'no', name: 'Norway'},
		{code: 'om', name: 'Oman'},
		{code: 'pk', name: 'Pakistan'},
		{code: 'pw', name: 'Palau'},
		{code: 'ps', name: 'Palestine, State of'},
		{code: 'pa', name: 'Panama'},
		{code: 'pg', name: 'Papua New Guinea'},
		{code: 'py', name: 'Paraguay'},
		{code: 'pe', name: 'Peru'},
		{code: 'ph', name: 'Philippines'},
		{code: 'pn', name: 'Pitcairn'},
		{code: 'pl', name: 'Poland'},
		{code: 'pt', name: 'Portugal'},
		{code: 'pr', name: 'Puerto Rico'},
		{code: 'qa', name: 'Qatar'},
		{code: 're', name: 'Réunion'},
		{code: 'ro', name: 'Romania'},
		{code: 'ru', name: 'Russian Federation'},
		{code: 'rw', name: 'Rwanda'},
		{code: 'bl', name: 'Saint Barthélemy'},
		{code: 'sh', name: 'Saint Helena, Ascension and Tristan da Cunha'},
		{code: 'kn', name: 'Saint Kitts and Nevis'},
		{code: 'lc', name: 'Saint Lucia'},
		{code: 'mf', name: 'Saint Martin (French part)'},
		{code: 'pm', name: 'Saint Pierre and Miquelon'},
		{code: 'vc', name: 'Saint Vincent and the Grenadines'},
		{code: 'ws', name: 'Samoa'},
		{code: 'sm', name: 'San Marino'},
		{code: 'st', name: 'Sao Tome and Principe'},
		{code: 'sa', name: 'Saudi Arabia'},
		{code: 'sn', name: 'Senegal'},
		{code: 'rs', name: 'Serbia'},
		{code: 'sc', name: 'Seychelles'},
		{code: 'sl', name: 'Sierra Leone'},
		{code: 'sg', name: 'Singapore'},
		{code: 'sx', name: 'Sint Maarten (Dutch part)'},
		{code: 'sk', name: 'Slovakia'},
		{code: 'si', name: 'Slovenia'},
		{code: 'sb', name: 'Solomon Islands'},
		{code: 'so', name: 'Somalia'},
		{code: 'za', name: 'South Africa'},
		{code: 'gs', name: 'South Georgia and the South Sandwich Islands'},
		{code: 'ss', name: 'South Sudan'},
		{code: 'es', name: 'Spain'},
		{code: 'lk', name: 'Sri Lanka'},
		{code: 'sd', name: 'Sudan'},
		{code: 'sr', name: 'Suriname'},
		{code: 'sj', name: 'Svalbard and Jan Mayen'},
		{code: 'sz', name: 'Swaziland'},
		{code: 'se', name: 'Sweden'},
		{code: 'ch', name: 'Switzerland'},
		{code: 'sy', name: 'Syrian Arab Republic'},
		{code: 'tw', name: 'Taiwan, Province of China'},
		{code: 'tj', name: 'Tajikistan'},
		{code: 'tz', name: 'Tanzania, United Republic of'},
		{code: 'th', name: 'Thailand'},
		{code: 'tl', name: 'Timor-Leste'},
		{code: 'tg', name: 'Togo'},
		{code: 'tk', name: 'Tokelau'},
		{code: 'to', name: 'Tonga'},
		{code: 'tt', name: 'Trinidad and Tobago'},
		{code: 'tn', name: 'Tunisia'},
		{code: 'tr', name: 'Turkey'},
		{code: 'tm', name: 'Turkmenistan'},
		{code: 'tc', name: 'Turks and Caicos Islands'},
		{code: 'tv', name: 'Tuvalu'},
		{code: 'ug', name: 'Uganda'},
		{code: 'ua', name: 'Ukraine'},
		{code: 'ae', name: 'United Arab Emirates'},
		{code: 'gb', name: 'United Kingdom of Great Britain and Northern Ireland'},
		{code: 'us', name: 'United States of America'},
		{code: 'um', name: 'United States Minor Outlying Islands'},
		{code: 'uy', name: 'Uruguay'},
		{code: 'uz', name: 'Uzbekistan'},
		{code: 'vu', name: 'Vanuatu'},
		{code: 've', name: 'Venezuela (Bolivarian Republic of)'},
		{code: 'vn', name: 'Vietnam'},
		{code: 'vg', name: 'Virgin Islands (British)'},
		{code: 'vi', name: 'Virgin Islands (U.S.)'},
		{code: 'wf', name: 'Wallis and Futuna'},
		{code: 'eh', name: 'Western Sahara'},
		{code: 'ye', name: 'Yemen'},
		{code: 'zm', name: 'Zambia'},
		{code: 'zw', name: 'Zimbabwe'}
	];

	var codes = {};

	for (var i = 0; i < list.length; ++i) {
		var entry = list[i];
		codes[entry.code] = entry;
	}
	
	// public methods
	
	this.getList= function() {
		return list;
	};

	this.getEntry = function(code) {
		return codes[code] || null;
	};
};

// Example usage:

var pl = Countries.getEntry('pl');
var gb = Countries.getEntry('gb');
var us = Countries.getEntry('us');
var jp = Countries.getEntry('jp');

console.log(pl.name); // Poland
console.log(gb.name); // United Kingdom of Great Britain and Northern Ireland
console.log(us.name); // United States of America
console.log(jp.name); // Japan