Siena or Sienna: How To spell?
The word Siena is misspelled against Sienna, a noun meaning "Clay that is colored red or brown by the oxides of iron or manganese, and used as a pigment. It is used either in the raw state or burnt."
Sienna has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings sie & a which should not be misspelled with single 'N'
Wrong Spelling:  sie-n-a  Correct Spelling:  sie-nn-a 
Find more wrongly spelled words of Sienna to spell it well.