One theory suggests the name stems from a palatalised version of the Mongolian and Turkic word tenggis, meaning "ocean", "oceanic" or "wide-spreading". (Lake Baikal and ocean were called tenggis by the Mongols. However, it seems that if they had meant to call Genghis tenggis they could have said, and written, "Tenggis Khan", which they did not.) Zhèng (Chinese: 正) meaning "right", "just", or "true", would have received the Mongolian adjectival modifier -s, creating "Jenggis", which in medieval romanization would be written "Genghis". It is likely that the 13th century Mongolian pronunciation would have closely matched "Chinggis".