This is a list of alternate placenames, alter-towns etc. from the Interference TL, obviously up to the epoch I'm writing. I'll regularly update this too, every century or so on. Keep in mind I'm not sure if the names will remain the same up to the assumed *present whence the TL is narrated.
Africa [ ]
Placename
OTL equivalent
Zenete Desert
Sahara, at least the western part
Mauretania , later in shorter Mauria or (preferred. less literary) Mornavia
Morocco
Septem -> Sefta
Ceuta
Rawel/Ruel
Rif mountains
Ulili
Volubilis, Morocco, not abandoned in TTL
Warzazata
Ouarzazate
Lesvallia
Kabylia
Murnathya, Mornavia (a name for Mauria/Mauretania, OTL Morocco)
Marrakech
Gadir
Agadir
M'luvi river
Moulouya river, Morocco
Gasfr Sifna
not existing OTL, a castle in central Atlas, Morocco
Guarda Catòlica da Moreia, later Moreia
Casablanca
Mauretania Ultima
Mauritania
Numidia
Algeria
Kabylonica or Ikhuzi or St. James of Ikhuzi
Algiers
Nat'Rathen
Larba, Algeria
Igilgi
Jijel, Algeria
Stifa
Sétif
Tlemsen
Tlemcen
Ifrigia , later Punia
Tunisia
Bardapolis
Tunis
Byzacena -> Visaddine
eastern central Ifrigia, *OTL Tunisia
Djirva
Djerba
Bagradas river
Medjerda river, Tunisia
Gavissa
Gafsa
Thermeli
Hammamet
Kirvana
Qairawan, Tunisia
Kerkunia
Kerkouane, Tunisia
Jarthousa
Bizert, Tunisia
Tafrura
Sfax
Ziqqwana
Zaghouan, Tunisia
Kaladiopi
Marsa Ibrahim, Eritrea; "Ethiopian Port" established by Templars from Egypt
Gold Coast
Ghana
Jeliba
Niger river
Moon islands
Comoros
Hausaland
southern Niger and northern Nigeria
Idrasian
Kabyle
Beira
southern Mozambico
Asia Minor [ ]
Placename
OTL equivalent
Melitene
Malatya
Theodosiopolis
Erzerum
Sebastea
Sivas
Tephrike
Divriği
Caesarea (Latin/Greek) / Mazhak (Armenian)
Kayseri, Turkey
Edessa
Urfa/Sanliurfa, Turkey
Claudiopolis -> Bithynion
Bolu, Bithynia, Turkey
Blekiokastron
Birecik
Sebastopolis
Sulusaray, Turkey
Loristan
northern Armenia
Basiliokastron
not existing in OTL, a city-fortress in the western Taurus, south Anatolia
Perrhai
Adıyaman
Pelagamborion
Seddülbahir: in TTL it is a thriving custom port.
Ahlat
Armenia, at least its southern and southwestern parts
Frangonica
Yenişehir, western Turkey
Kappadokios river
Delice river, central Turkey
Karakilisa
Vanadzor/Kirovakan
Kotiaion (Cotyaeum)
Kütahya
Amida
Diyarbakir
Caucasian Albania
Azerbaijan
British Isles [ ]
Placename
OTL equivalent
Alba
Scottish Highlands, "Pictavia"
Alban Islands
collective name for Shetlands, Orkneys, Hebrides
Yorwich
York
Mona
Anglesey
Moeleicoel
Coleshill
Penfro
Pembroke, Wales
Cumbria
Cumberland
Northumbria
Yorkshire
Inverair
Ayr
DunBrython
Dumbarton
France [ ]
Placename
OTL equivalent
Brevasque
Dauphiné
Peyra-Lada
Pierrelatte, Drôme, Rhône Alpes
Momadrouna pass
an alt-Occitan name for OTL Montgenèvre/Monginevro pass
Robertingians
Capetingians
Chateau-Lunain
not existing OTL, somewhere south of Paris
Septimania. Later supersided by Languedoc - linguistic definition - and increasingly Gadary - land of Cathars - to indicate the whole OTL French extreme Midi
Roussillon
Norman style
Gothic style in art
Bordèu
Bordeaux
Balz-Arenjo
Baux-Orange
Hesperia / America [ ]
Placename
OTL equivalent
Helluland
Baffin island
Markland
Labrador
Vinlandria
a later Euro corruption for OTL Newfoundland proper, island
Thorfinnsvìk
not existing OTL, some 50 kms due west of OTL St.Anthony, Newfoundland, Canada
Helluland Sound
Baffin Bay
New Palestine
Massachussetts, New Hampshire and Maine
Thorsteinsflo
town in OTL Dingwall Bay, Cape Breton, Canada
Marksey
Cape Breton island, Canada
Rauthljudar (Red Screamers)
Beothuks of Newfoundland, more or less mixed with Norsemen
Eiriksnes, first successful Euro settlement in mainland Hesperia
A town on OTL Cape George Point
Skraelingarland, later Screlingia
Acadia
Vesteyjar ("Western Isles")
An early Norse name for Hesperia
Rwadhas
Mandans
Markseyfjordur
Bras d'Or Lake, Cape Breton, Canada
Bakkland
Québec and Ontario
Kandarvannsvìk
near OTL Québec city
Kandarvannà river
St. Lawrence river
Nipinniswi
Cahokia
Mayambeck river
Ohio river
Midhimikkmà
Little Southwest Miramichi river, New Brunswick, Canada: "middle Micmac river"
Desategués
Iroquois
Palenque
Chiapas
Iberia [ ]
Placename
OTL equivalent
Rio Grande
Guadalquivir
Gallastria
Spanish Galicia plus Asturias
Arx Roderici -> Arrodriga
Gibraltar
Elbira
Granada
Transierra
Extremadura, Spain
Arrogadana
Badajoz
Sardubia
Marbella, Spain
Matxados de Areistana
near OTL Moura, Portugal
Santa Cruz
Madeira island
St. James' island
Alboràn island
Gumbusdeira
Santiago de Compostela, in Gallastrian
San Pedro de las Lagunas
Daimiel, Spain
Los Secados
la Mancha, Spain
Atlantides
the Azores
Laobrivia
Algarve, Portugal
Tamaràn
Gran Canaria island
Porto Lucente
Alicante, Spain
Italy [ ]
Placename
OTL equivalent
Zividal tal Friul
Cividale del Friuli
Friul
Friuli
Murgia Basilica
not existing OTL, inner central Puglia
Castroleone
Campo Tenese, Calabria, Italy
Brischna
Bressanone/Brixen
Trient
Trento
Gurizberg (formal), Grizza (Ladin Friulian)
Gorizia
Lombard plain
Padan plain
Fiumara Rossa
a Sicilian river on the northern coast not existing OTL with this name
Castiglione Canossa
Castiglione delle Stiviere
Udena
Udine, Italy
Comagne
western Friuli, the “magredi” area: "Lesser Cumania"
Sklaviniai / Balkans [ ]
Placename
OTL equivalent
Zahumlje, later Hum/Dukovina
Hercegovina
Dioclea -> Duklja, later Zeta, eventually Melanoria
Montenegro
Vlakorai/Vlachorai
Balkan range proper
Dyrrachion
Dūrres; nonetheless called the Albanian way by inhabitants?
Skupiokastritsa
Skopje
Hemochorion
not existing OTL, a place somewhere in OTL Stara Planina, Balkans proper
Travunja/Trivalja
a medieval sub-kingdom due north of OTL Montenegro
Cumania
Moldavia
Demetriada
Svilengrad, Bulgaria
East Asia [ ]
Placename
OTL equivalent
Asman Tau/Tenghri Tagh
Tien Shan
Champa
southern Vietnam
Xijian
Lanzhou, Gansu, NW China
Vijaya
Binh Dinh, Vietnam
Dadu/Khanbaliq (still to be stated if subsequently renamed Beijing as per OTL)
Beijing
Suvarnapura (“the golden city”)
Jhang, Pakistan
Muang Sua
Luang Prabang
Suvarnapura
Jhang
diverse [ ]
Placename
OTL equivalent
Taurida
Crimea
Taurocherson
Sebastopol, Crimea
Romancia
Graubünden/Grigioni, Switzerland, plus Valtellina, Vorarlberg and Sankt Gallen, maybe Glarus?
Muwahiddin
The Druzes
Arousion
Kheurbet al-Aarous; only Byzantine name? Turks and Syriac own names?
San Gall
Ladin-Rumantsch for OTL Sankt Gallen
Alamannia
northern Switzerland
Selonia/Selene
eastern Latvia and Lithuania?
Hordebruck
Landshut, Bavaria
Zwanstenhafen
Königsberg
Brasta/Berestye
Brest-Litovsk
Chremis
Krems an der Donau
Mersk
Galich, Kostroma Oblast, Russia
Callinicum
Raqqa, Syria
Lower Lorraine
“Belgium”
Simeonica
Laodicea/Latakia