This is about place names/ethnic or tribal names/river designations... that could be connected with ancient Proto-Slavs and/or early Poles.
let me start with two place names
Bylazora (217-168 BC) - Macedonia, Balkan, South-Eastern Europe
en.wikipedia.org/wiki/Bylazora
NOTE: Most probably that place name was Bylazora. But, no matter was it originally Bylazora or Vylazora both words could be explained by the Slavic languages.
prefixes in Serbian >>> Byla/Vyla = White/Fairy in Eng.
suffix in Serb. >>> zora = morning in Eng.
So, place name in Serbian has meaning >>> White morning / Morning fairy
Troy/Trojans/Trojan War (1334-1184 BC) - Anatolia
en.wikipedia.org/wiki/Troy
NOTE: Word Troy that is by Greeks and Romans recorded as Troia/Trōia, from the point of view of Slavic languages could be simple translated as Three or Third. It possible referred on three hills where town was built or possible on old Slavic God Triglav (Three-heads) that was often seen as three-headed God that looks on three sides of the World. Considering that ancient towns regularly were built on the tops of the hills it is quite possible that Troy was built on the hill that previously was dedicated/named after Triglav God or even city of Troy itself was dedicated to Triglav, to three-headed God.
let me start with two place names
Bylazora (217-168 BC) - Macedonia, Balkan, South-Eastern Europe
en.wikipedia.org/wiki/Bylazora
Bylazora or Vylazora was a Paionian city from the period of early classic antiquity. It is located in Ovèe Pole, a valley in the Republic of Macedonia, 4 km away from present day Sveti Nikole. It was a large city, with an area of about 19 hectares.
According to experts, there are two significant dates related to the relations between ancient Macedonia and Bylazora: The first is 217 B.C. when king Philip V of Macedonia reconstructed its fortifications; The second is 168 B.C. when king Perseus of Macedonia, during the Third Macedonian War, arranged military support from the Gauls who were camping nearby, in defending the city against the Romans.
NOTE: Most probably that place name was Bylazora. But, no matter was it originally Bylazora or Vylazora both words could be explained by the Slavic languages.
prefixes in Serbian >>> Byla/Vyla = White/Fairy in Eng.
suffix in Serb. >>> zora = morning in Eng.
So, place name in Serbian has meaning >>> White morning / Morning fairy
Troy/Trojans/Trojan War (1334-1184 BC) - Anatolia
en.wikipedia.org/wiki/Troy
Ancient Greek historians placed the Trojan War variously in our 12th, 13th, or 14th century BC: Eratosthenes to 1184 BC, Herodotus to 1250 BC, Duris of Samos to 1334 BC. Modern archaeologists associate Homeric Troy with archaeological Troy VII.
NOTE: Word Troy that is by Greeks and Romans recorded as Troia/Trōia, from the point of view of Slavic languages could be simple translated as Three or Third. It possible referred on three hills where town was built or possible on old Slavic God Triglav (Three-heads) that was often seen as three-headed God that looks on three sides of the World. Considering that ancient towns regularly were built on the tops of the hills it is quite possible that Troy was built on the hill that previously was dedicated/named after Triglav God or even city of Troy itself was dedicated to Triglav, to three-headed God.