Feminine form of Junius or variant of Juno, June, Junia or Djuna. Also a south Slavic name and thus a feminine form of masculine names like Junij, Junii, Juno, Junian or Junak. The Slavic element "jun/iun" means "young". The name has been used as a given name since 1919.
This name can have many meaning depending on the kanji it is written in. If it is written as 樹南, 樹 (ju) means "timber; trees; wood; establish; set up" and 南 means "south".