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Answer
Portuguese sailors referred to this stretch of the African coast as "Serra da Leoa," the “Lion Mountain,” later translated to Italian on some maps.
Sierra Leone
Derived possibly from "Biru," either the name of a local ruler living in contemporary Panama, or a (non-existent) ethnic group thought to live along the Pacific coast further south.
Peru
From Greek, “Indian Island.”
Indonesia
From the Latin "romanus," meaning “citizen of Rome.”
Romania
From an English interpretation of the Portuguese "Rio dos Camarões" (Shrimp River).
Cameroon
The essential word of the country’s name derived from an Italian explorer, Amerigo Vespucci.
United States of America
Asian coastal country named, according to legend, from an expression, “Baru nah!” (“That’s it!”) uttered by founder Awang Alak Tetatar.
Brunei
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Answer
Possibly from the Sumerian city of Uruk.
Iraq
Former name derived from a Portuguese interpretation of an expression of the Kikongo language, "Ndzere," meaning “the river that swallows all rivers.”
Zaire
The Greek name appears twice in the Iliad, according to Pliny the Elder derived from a man named Aethiops.
Ethiopia
South American country named for a circle of latitude, sometimes called the great circle.
Ecuador
Named for an empire in West Africa, located northwest of the current country.
Ghana
The first part of the name derived from an historical association with the Huns, and the second from a Latinized form of Byzantine Greek, "Oungroi."
Hungary
Probably from the Iroquoian word "kanata," meaning “village” or settlement.”
1. The equator isn't often known as *the* great circle. It is, however, recognised as being *one* of the various great circles. (A great circle is the largest-possible circle that can be drawn on a sphere. e.g. all of the Meridians are also great circles.)
2. Clues about the equator also apply to Equatorial Guinea.
Thanks for the nice comment. Re: Ecuador, hence the "sometimes." I can't think of any other country that would qualify, should provide enough info to get it. At least if you know a bit of Spanish.
N.B. for the Ecuador question:
1. The equator isn't often known as *the* great circle. It is, however, recognised as being *one* of the various great circles. (A great circle is the largest-possible circle that can be drawn on a sphere. e.g. all of the Meridians are also great circles.)
2. Clues about the equator also apply to Equatorial Guinea.