On the front and back of EMCE Khan, the Mugato is spelled "Mugato". On the front of the Uhura and Mugato, it is also spelled "Mugato". But on the back of the Uhura and Mugato cards, the Mugato is now spelled "Mugatu".
EMCE wasn't the only one unable to decide on which spelling to go with..
Michael Crawford's Review of the Week
Playmates couldn't settle on a spelling either.. using the U for their 4" fig, but the O for the 12"..