Etymology
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Moravia 

region in central Europe, Medieval Latin, named for the River Morva (German March, Latin Marus), which runs through it.

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Nigeria 

West African nation, named for river Niger, which runs through it, + country name ending -ia. Related: Nigerian.

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Aragon 

medieval northern Spanish kingdom, named for a river that runs through it, probably from a PIE root meaning "water." Related: Aragonese (late 14c., Arragounneys); Middle English also had a noun Aragoner.

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Ecuador 
from the Spanish form of equator (which runs through it). Before 1830 the region bore the name of its chief city, Quito, which is from the name of a now-extinct native people, of unknown meaning. Related: Ecuadorian; Ecuadorean.
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Danzig 

German name of Polish Gdańsk,city on the Baltic coast of Poland, perhaps from Gdania, an older name for the river that runs through it, or from Gothic Gutisk-anja "end of the (territory of the) Goths." The spelling (attested from 13c.) in the German form of the name perhaps suggests a connection with Dane.

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Congo 
African nation, named for the river that runs through it, which is from a Bantu word meaning "mountains" (i.e., the river that flows from the mountains). As an adjective, Congoese is native English (1797) but has been supplanted by Congolese (1900), from French Congolais.
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Maine 

U.S. state, probably ultimately from French Maine, region in France (named for the river that runs through it, which has a name of Gaulish origin). The name was applied to that part of coastal North America by French explorers. The Maine law in late 19c.-early 20c. prohibitionist jargon refers to the strict statute passed there in 1851 against the sale and manufacture of intoxicating liquor, which became models for other states.

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