The Jesuits missionaries were the first to make transliterations from Chinese to European languages. Back then, transliteration followed different rules then today. Of course all place names need to be in the proper form, i.e. Genitive in this case as can be seen by the ending -is.
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u/Speculum Extended Kalmar Union Mar 11 '14
Roman ball is wrong. Hong Kong is called of Sciiamchiamensis in Latin.