For the meaning of Mete (in Turkish), the Turkish form of Modu has been entered as meaning. But for Modu "Modu Chanyu was a 3rd-century BC ruler of the Xiongnu, a people from Mongolia." has been entered. First, Modu Chanyu is the Chinese form of Mete. Second, Xiongnu is still the Chinese form of the Great Hun Empire. Third Huns, or in your terms Xiongnus are not people from Mongolia but they are from Early Turkic Tribes and/or Nations. I acknowledge this fact because it is my name. Most of the information is coming from Chinese sources unfortunately and they do care about easy information rather than real one.