Northern Xiongnu

Japanese: 北匈奴 - きたきょうど

…He also called himself Huhanye Chanyu, was pardoned, and moved to live within the Great Wall. His tribes were divided and lived in various areas, such as Yunzhong, during the Later Han Dynasty, and were put in charge of defending China. They were called the Southern Xiongnu, and the original Xiongnu who remained in Mongolia were called the Northern Xiongnu. The Later Han Dynasty sent officials such as the Chief of the Xiongnu Mission to the Southern Xiongnu to monitor them, but the rule of the various tribes under the Southern Chanyu continued. …

From "Five Barbarians and Sixteen Kingdoms"

…At the beginning of the Later Han dynasty, the Xiongnu split into two factions, the Northern and Southern, and the Southern Xiongnu surrendered to the Han. The Northern Xiongnu were attacked by the combined forces of the Han and Southern Xiongnu and moved westward, some of whom appeared on the Black Sea coast (as the Huns), and are said to have been the cause of the Great Migration of Peoples in Europe. The decline of the Xiongnu power transformed the relationship between China and the surrounding peoples. …

*Some of the terminology that refers to the "Northern Xiongnu" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…彼もまた呼韓邪単于と号し，許されて長城内に移り住み，その諸部は後漢の雲中など諸部に分かれ住み，中国の守備に任じた。これを南匈奴と称し，モンゴリアにとどまった従来の匈奴を北匈奴と称した。　南匈奴には後漢より使匈奴中郎将以下の官吏が派遣され，その監視に当たったが，南単于の諸部族統治は存続した。…