The last name or title "Khan" is not Islamic or Arabic or Persian or Pathan.It is mongolian in origin Khan-comes from Khagan -The mongolian term for "Singh" or "Sardar" ( warrior / chief ) Mongolian flag is actually the pictorial depiction of a vedic fire pit--a havan kund with the Yin and Yang symbol ( of shiva and shakti ) at its centre with the Sun (Rudra) and Half moon ( Devi) rising above it.The symbol was the flag of the Bogde Khaganate empire of Mongolia which in turn was inspired by the battle standard of Mehar Gul' 6. Chenghis Khan's Grandson, Kublai Khan consecrated a Shiva temple , one can find Tamil Inscription there..
In Chuan Chou, there was a Sivan Temple. In that temple, an image of Siva was consecrated under the 'Firman' - royal orders of 'Sekasai Khan'. This was done for the health of 'Sekasai Khan'. 'Sekasai Khan' in this inscription is the name of Kublai Khan himself.