diff --git a/src/timezone/titleCase.js b/src/timezone/titleCase.js
index 63175b6..15717b7 100644
--- a/src/timezone/titleCase.js
+++ b/src/timezone/titleCase.js
@@ -1,3 +1,12 @@
+//iana spellings that title-casing alone gets wrong, mostly legacy names
+const spellings = [
+  'ACT', 'CET', 'EET', 'EST', 'GB', 'HST', 'LHI', 'MET', 'MST', 'NSW', 'NZ', 'PRC', 'ROC', 'ROK',
+  'UCT', 'US', 'WET', 'CST6CDT', 'EST5EDT', 'MST7MDT', 'PST8PDT', 'GMT0', 'GMT+0', 'GMT-0',
+  'GB-Eire', 'NZ-CHAT', 'W-SU', 'BajaNorte', 'BajaSur', 'ComodRivadavia', 'DeNoronha',
+  'DumontDUrville', 'EasterIsland', 'Knox_IN', 'McMurdo', 'Port-au-Prince'
+]
+const special = new Map(spellings.map(w => [w.toLowerCase(), w]))
+
 //iana codes are case-sensitive, technically
 const titleCase = str => {
   str = str[0].toUpperCase() + str.substr(1)
@@ -7,12 +16,9 @@ const titleCase = str => {
   str = str.replace(/_(of|es)_/i, (s) => s.toLowerCase())
   str = str.replace(/\/gmt/i, '/GMT')
   str = str.replace(/\/utc/i, '/UTC')
-  str = str.replace(/\/Dumontdurville$/i, '/DumontDUrville')
-  str = str.replace(/\/Mcmurdo$/i, '/McMurdo')
-  str = str.replace(/\/Port-au-prince$/i, '/Port-au-Prince')
   if (str === 'Utc') {
     str = 'UTC'
   }
-  return str
+  return str.split('/').map(part => special.get(part.toLowerCase()) || part).join('/')
 }
 export default titleCase
diff --git a/tests/timezones/iana-spelling.test.js b/tests/timezones/iana-spelling.test.js
new file mode 100644
index 0000000..33393c7
--- /dev/null
+++ b/tests/timezones/iana-spelling.test.js
@@ -0,0 +1,124 @@
+import test from 'tape'
+import spacetime from '../_lib/index.js'
+
+// spelling of every bundled zone that tzdb 2026c knows, 'backward' links included
+const iana = `
+Africa/Abidjan Africa/Accra Africa/Addis_Ababa Africa/Algiers Africa/Asmara Africa/Asmera
+Africa/Bamako Africa/Bangui Africa/Banjul Africa/Bissau Africa/Blantyre Africa/Brazzaville
+Africa/Bujumbura Africa/Cairo Africa/Casablanca Africa/Ceuta Africa/Conakry Africa/Dakar
+Africa/Dar_es_Salaam Africa/Djibouti Africa/Douala Africa/El_Aaiun Africa/Freetown Africa/Gaborone
+Africa/Harare Africa/Johannesburg Africa/Juba Africa/Kampala Africa/Khartoum Africa/Kigali
+Africa/Kinshasa Africa/Lagos Africa/Libreville Africa/Lome Africa/Luanda Africa/Lubumbashi
+Africa/Lusaka Africa/Malabo Africa/Maputo Africa/Maseru Africa/Mbabane Africa/Mogadishu
+Africa/Monrovia Africa/Nairobi Africa/Ndjamena Africa/Niamey Africa/Nouakchott Africa/Ouagadougou
+Africa/Porto-Novo Africa/Sao_Tome Africa/Timbuktu Africa/Tripoli Africa/Tunis Africa/Windhoek
+America/Adak America/Anchorage America/Anguilla America/Antigua America/Araguaina
+America/Argentina/Buenos_Aires America/Argentina/Catamarca America/Argentina/ComodRivadavia
+America/Argentina/Cordoba America/Argentina/Jujuy America/Argentina/La_Rioja
+America/Argentina/Mendoza America/Argentina/Rio_Gallegos America/Argentina/Salta
+America/Argentina/San_Juan America/Argentina/San_Luis America/Argentina/Tucuman
+America/Argentina/Ushuaia America/Aruba America/Asuncion America/Atikokan America/Atka America/Bahia
+America/Bahia_Banderas America/Barbados America/Belem America/Belize America/Blanc-Sablon
+America/Boa_Vista America/Bogota America/Boise America/Buenos_Aires America/Cambridge_Bay
+America/Campo_Grande America/Cancun America/Caracas America/Catamarca America/Cayenne America/Cayman
+America/Chicago America/Chihuahua America/Ciudad_Juarez America/Coral_Harbour America/Cordoba
+America/Costa_Rica America/Coyhaique America/Creston America/Cuiaba America/Curacao
+America/Danmarkshavn America/Dawson America/Dawson_Creek America/Denver America/Detroit
+America/Dominica America/Edmonton America/Eirunepe America/El_Salvador America/Ensenada
+America/Fort_Nelson America/Fort_Wayne America/Fortaleza America/Glace_Bay America/Godthab
+America/Goose_Bay America/Grand_Turk America/Grenada America/Guadeloupe America/Guatemala
+America/Guayaquil America/Guyana America/Halifax America/Havana America/Hermosillo
+America/Indiana/Indianapolis America/Indiana/Knox America/Indiana/Marengo America/Indiana/Petersburg
+America/Indiana/Tell_City America/Indiana/Vevay America/Indiana/Vincennes America/Indiana/Winamac
+America/Indianapolis America/Inuvik America/Iqaluit America/Jamaica America/Jujuy America/Juneau
+America/Kentucky/Louisville America/Kentucky/Monticello America/Knox_IN America/Kralendijk
+America/La_Paz America/Lima America/Los_Angeles America/Louisville America/Lower_Princes
+America/Maceio America/Managua America/Manaus America/Marigot America/Martinique America/Matamoros
+America/Mazatlan America/Mendoza America/Menominee America/Merida America/Metlakatla
+America/Mexico_City America/Miquelon America/Moncton America/Monterrey America/Montevideo
+America/Montreal America/Montserrat America/Nassau America/New_York America/Nipigon America/Nome
+America/Noronha America/North_Dakota/Beulah America/North_Dakota/Center
+America/North_Dakota/New_Salem America/Nuuk America/Ojinaga America/Panama America/Pangnirtung
+America/Paramaribo America/Phoenix America/Port_of_Spain America/Port-au-Prince America/Porto_Acre
+America/Porto_Velho America/Puerto_Rico America/Punta_Arenas America/Rainy_River
+America/Rankin_Inlet America/Recife America/Regina America/Resolute America/Rio_Branco
+America/Rosario America/Santa_Isabel America/Santarem America/Santiago America/Santo_Domingo
+America/Sao_Paulo America/Scoresbysund America/Shiprock America/Sitka America/St_Barthelemy
+America/St_Johns America/St_Kitts America/St_Lucia America/St_Thomas America/St_Vincent
+America/Swift_Current America/Tegucigalpa America/Thule America/Thunder_Bay America/Tijuana
+America/Toronto America/Tortola America/Vancouver America/Virgin America/Whitehorse America/Winnipeg
+America/Yakutat America/Yellowknife
+Antarctica/Casey Antarctica/Davis Antarctica/DumontDUrville Antarctica/Macquarie Antarctica/Mawson
+Antarctica/McMurdo Antarctica/Palmer Antarctica/Rothera Antarctica/South_Pole Antarctica/Syowa
+Antarctica/Troll Antarctica/Vostok
+Arctic/Longyearbyen
+Asia/Aden Asia/Almaty Asia/Amman Asia/Anadyr Asia/Aqtau Asia/Aqtobe Asia/Ashgabat Asia/Ashkhabad
+Asia/Atyrau Asia/Baghdad Asia/Bahrain Asia/Baku Asia/Bangkok Asia/Barnaul Asia/Beirut Asia/Bishkek
+Asia/Brunei Asia/Calcutta Asia/Chita Asia/Choibalsan Asia/Chongqing Asia/Chungking Asia/Colombo
+Asia/Dacca Asia/Damascus Asia/Dhaka Asia/Dili Asia/Dubai Asia/Dushanbe Asia/Famagusta Asia/Gaza
+Asia/Harbin Asia/Hebron Asia/Ho_Chi_Minh Asia/Hong_Kong Asia/Hovd Asia/Irkutsk Asia/Istanbul
+Asia/Jakarta Asia/Jayapura Asia/Jerusalem Asia/Kabul Asia/Kamchatka Asia/Karachi Asia/Kashgar
+Asia/Kathmandu Asia/Katmandu Asia/Khandyga Asia/Kolkata Asia/Krasnoyarsk Asia/Kuala_Lumpur
+Asia/Kuching Asia/Kuwait Asia/Macao Asia/Macau Asia/Magadan Asia/Makassar Asia/Manila Asia/Muscat
+Asia/Nicosia Asia/Novokuznetsk Asia/Novosibirsk Asia/Omsk Asia/Oral Asia/Phnom_Penh Asia/Pontianak
+Asia/Pyongyang Asia/Qatar Asia/Qostanay Asia/Qyzylorda Asia/Rangoon Asia/Riyadh Asia/Saigon
+Asia/Sakhalin Asia/Samarkand Asia/Seoul Asia/Shanghai Asia/Singapore Asia/Srednekolymsk Asia/Taipei
+Asia/Tashkent Asia/Tbilisi Asia/Tehran Asia/Tel_Aviv Asia/Thimbu Asia/Thimphu Asia/Tokyo Asia/Tomsk
+Asia/Ujung_Pandang Asia/Ulaanbaatar Asia/Ulan_Bator Asia/Urumqi Asia/Ust-Nera Asia/Vientiane
+Asia/Vladivostok Asia/Yakutsk Asia/Yangon Asia/Yekaterinburg Asia/Yerevan
+Atlantic/Azores Atlantic/Bermuda Atlantic/Canary Atlantic/Cape_Verde Atlantic/Faeroe Atlantic/Faroe
+Atlantic/Jan_Mayen Atlantic/Madeira Atlantic/Reykjavik Atlantic/South_Georgia Atlantic/St_Helena
+Atlantic/Stanley
+Australia/ACT Australia/Adelaide Australia/Brisbane Australia/Broken_Hill Australia/Canberra
+Australia/Currie Australia/Darwin Australia/Eucla Australia/Hobart Australia/LHI Australia/Lindeman
+Australia/Lord_Howe Australia/Melbourne Australia/North Australia/NSW Australia/Perth
+Australia/Queensland Australia/South Australia/Sydney Australia/Tasmania Australia/Victoria
+Australia/West Australia/Yancowinna
+Brazil/Acre Brazil/DeNoronha Brazil/East Brazil/West
+Canada/Atlantic Canada/Central Canada/Eastern Canada/Mountain Canada/Newfoundland Canada/Pacific
+Canada/Saskatchewan Canada/Yukon
+CET CST6CDT Cuba EET Egypt Eire EST EST5EDT Factory GB GB-Eire GMT-0 GMT+0 GMT0 Greenwich Hongkong
+HST Iceland Iran Israel Jamaica Japan Kwajalein Libya MET MST MST7MDT Navajo NZ NZ-CHAT Poland
+Portugal PRC PST8PDT ROC ROK Singapore Turkey UCT Universal UTC W-SU WET Zulu
+Chile/Continental Chile/EasterIsland
+Etc/GMT Etc/GMT-1 Etc/GMT-10 Etc/GMT-11 Etc/GMT-12 Etc/GMT-13 Etc/GMT-14 Etc/GMT-2 Etc/GMT-3
+Etc/GMT-4 Etc/GMT-5 Etc/GMT-6 Etc/GMT-7 Etc/GMT-8 Etc/GMT-9 Etc/GMT+1 Etc/GMT+10 Etc/GMT+11
+Etc/GMT+12 Etc/GMT+2 Etc/GMT+3 Etc/GMT+4 Etc/GMT+5 Etc/GMT+6 Etc/GMT+7 Etc/GMT+8 Etc/GMT+9 Etc/GMT0
+Etc/Greenwich Etc/UCT Etc/Universal Etc/UTC Etc/Zulu
+Europe/Amsterdam Europe/Andorra Europe/Astrakhan Europe/Athens Europe/Belfast Europe/Belgrade
+Europe/Berlin Europe/Bratislava Europe/Brussels Europe/Bucharest Europe/Budapest Europe/Busingen
+Europe/Chisinau Europe/Copenhagen Europe/Dublin Europe/Gibraltar Europe/Guernsey Europe/Helsinki
+Europe/Isle_of_Man Europe/Istanbul Europe/Jersey Europe/Kaliningrad Europe/Kiev Europe/Kirov
+Europe/Kyiv Europe/Lisbon Europe/Ljubljana Europe/London Europe/Luxembourg Europe/Madrid
+Europe/Malta Europe/Mariehamn Europe/Minsk Europe/Monaco Europe/Moscow Europe/Nicosia Europe/Oslo
+Europe/Paris Europe/Podgorica Europe/Prague Europe/Riga Europe/Rome Europe/Samara Europe/San_Marino
+Europe/Sarajevo Europe/Saratov Europe/Simferopol Europe/Skopje Europe/Sofia Europe/Stockholm
+Europe/Tallinn Europe/Tirane Europe/Tiraspol Europe/Ulyanovsk Europe/Uzhgorod Europe/Vaduz
+Europe/Vatican Europe/Vienna Europe/Vilnius Europe/Volgograd Europe/Warsaw Europe/Zagreb
+Europe/Zaporozhye Europe/Zurich
+Indian/Antananarivo Indian/Chagos Indian/Christmas Indian/Cocos Indian/Comoro Indian/Kerguelen
+Indian/Mahe Indian/Maldives Indian/Mauritius Indian/Mayotte Indian/Reunion
+Mexico/BajaNorte Mexico/BajaSur Mexico/General
+Pacific/Apia Pacific/Auckland Pacific/Bougainville Pacific/Chatham Pacific/Chuuk Pacific/Easter
+Pacific/Efate Pacific/Enderbury Pacific/Fakaofo Pacific/Fiji Pacific/Funafuti Pacific/Galapagos
+Pacific/Gambier Pacific/Guadalcanal Pacific/Guam Pacific/Honolulu Pacific/Johnston Pacific/Kanton
+Pacific/Kiritimati Pacific/Kosrae Pacific/Kwajalein Pacific/Majuro Pacific/Marquesas Pacific/Midway
+Pacific/Nauru Pacific/Niue Pacific/Norfolk Pacific/Noumea Pacific/Pago_Pago Pacific/Palau
+Pacific/Pitcairn Pacific/Pohnpei Pacific/Ponape Pacific/Port_Moresby Pacific/Rarotonga
+Pacific/Saipan Pacific/Samoa Pacific/Tahiti Pacific/Tarawa Pacific/Tongatapu Pacific/Truk
+Pacific/Wake Pacific/Wallis Pacific/Yap
+US/Alaska US/Aleutian US/Arizona US/Central US/East-Indiana US/Eastern US/Hawaii US/Indiana-Starke
+US/Michigan US/Mountain US/Pacific US/Samoa
+`.trim().split(/\s+/)
+
+test('timezone name matches iana spelling', (t) => {
+  const spelling = new Map(iana.map((tz) => [tz.toLowerCase(), tz]))
+  const zones = Object.keys(spacetime().timezones)
+  for (let i = 0; i < zones.length; i += 1) {
+    const expected = spelling.get(zones[i])
+    if (expected) {
+      t.equal(spacetime.now(zones[i]).timezone().name, expected, expected)
+    }
+  }
+  t.end()
+})