There are two Khalkha Mongolian words, хан and хаан (according to the "Big Modern Russian-Mongolian and Mongolian-Russian Dictionary", by Yury Kruchkin, 2006, 115,000 entries, хан and хаан are mentioned on page 563, the dictionary is downloadable here, 77 ). The vowel length in Mongolian and other Altaic languages is the result of disappearance of the velar q and ɣ …