"Who am I?"
Translation:Chi sono io?
Word order is sometimes confusing in Italian but in this case it is perfectly ok to follow the same order as in English to arrive at a good translation. "Chi" = who, "sono" = am, "Io" = I.
Conversely, if you were to say "Chi Io sono" this would translate to "Who I am"
Hope this helps :)
Because it's "I am", not "I is".