The Black Sea by Neil Acherson which has been a journey taking loops a long long way from the littoral of the Euxine Sea. Euxine? = hospitable is an alternative name more commonly used in English when writers were familiar with ancient Greek. We'll get to Tamga [L] in due course.
Euxine reminds me of the Εὐμενίδες, Eumenídes =The Kindly Ones as the 'nice' name of the Erinyes Ἐρινύες = Furies the vengeful chthonic relentless divine instruments of justice in ancinet greek mythology. The intrusive power of Alecto Megaera Tisiphone was so frightening that folks referred to them as Eumenides as a soft answer to turn away wrath. Same with the sea whose standard name in olde Greek Πόντος Ἄξεινος Póntos Áxeinos the inhospitable sea. Áxeinos being a corruption of an old Persian root *axšaina = dark coloured. The sea-bed is littered with wrecks so the transliterated name made some sort of sense.
For many of these migratory hordes, the Black Sea coast was a temporary posting before they swept off Westward on the tide of history. The Alans, for example, a subset of the Sarmatians, have claims to have named Alençon, Orléans, Valence in France and the Alentejo in Portugal.