Short answers, pulled from the story.
The Thracian language ceased to be spoken after the sixth century AD. Contemporary references ended during this period, and complete obliteration likely occurred following the last known mentions in that timeframe.
Personal names from two monasteries in the Near East date to the sixth century AD. These are the most recently attested Thracian personal names known today according to historical records.
Ancient sources mention twenty-three words considered explicitly of Thracian origin with known meanings. Hesychius preserved about three dozen such items in his glossaries while other authors like Dioscorides and Galen recorded specific terms.
Bessian dialect was a branch of the Thracian language used by monks at a monastery on the Sinai Peninsula near Mount Sinai. It also appeared in four churches located near the Dead Sea at a place called Cutila.
Four long inscriptions survive from ancient Thracian contexts including a gold ring discovered in 1912 near Ezerovo village. Another inscription found in 1965 near Varbitsa Municipality remains undeciphered while a third ring dates to the fifth century BC.