From Latin Balticus, from Latin Balthae ("dwellers near the Baltic sea"). The ultimate origin is uncertain, but possibilities are:
From North Germanic *baltaz, in reference to the narrow entranceway of the sea
Related to Lithuanian baltas ("white") and Proto-Slavic *bolto ("swamp, bog, mud"), which is from Proto-Indo-European *bʰel- ("white")
Related to Latin balteus ("belt") (compare Proto-Germanic *baltijaz), referring to the Danish straits, "the Belts". This is suggested by Adam of Bremen, who in the 11th century first recorded the name (Balticus, eo quod in modum baltei longo tractu per Scithicas regiones tendatur usque in Greciam).
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