தமிழ்நாடு (Tamizhnadu or Tamilnadu or Tamizhnadu or TamilNadu)

When we write தமிழ்நாடு in தமிழ் it's a one world where as in English it is written as Tamil Nadu as two words.  This is wrong and not appropriate it should be written as Tamilnadu in English as well. The people of TN should refer it as Tamilnadu in all their written, online, typewriter usages.