Bergi

From the name of Bargu tribe (Barga Mongols), mentioned by Marco Polo, later put further northwards by cartographers into the area between Asia and America. Ultimately from Classical Mongolian ᠪᠠᠷᠭ᠋ᠤ (barɣu). Before or after the Anian Strait was (most probably falsely) reported found by L. Maldonado, the Bergi-name was moved by the cartographers to the eastern side of this strait, becoming a location in America (together with Anian and Tholm, also from Marco Polo, and sometimes also Arsarot, derived from Arzareth found on old maps of northern China). On the Blaeu's map both Bargu and Bergi are depicted each on opposite sites of the Anian Strait. It can be explained as the result of copying from two different maps, similarly to Zeno map depicting Iceland and Greenland together with their "twins" Grolandia and Frisland, and probably having two Shetlands.

来源：wiktionary