ハガンMeanings1nounkhanHistorical title for a ruler or military leader in Central Asia, equivalent to 'khan'. This form is from 'khaghan'.See also: ハンモンゴル帝てい国こくのハガンは広こう大だいな領りょう土どを支し配はいした。The khan of the Mongol Empire ruled over a vast territory.