Sometimes the pronunciation of Imoen sounds like /eməuen/, sometimes like /iməuen/.
And there are some discussion about this. For example:http://viktorie.fuzzymonkey.net/~diana/forum/showthread.php?t=4122
---It's pronounced like the letter "M" "O" and "N" together."
---And it looks like a typo of Imogen. Imogen and Ione, as mentioned above are much better in my opinion since they are actual names.
---It does look like a typo of Imogen! LOL
---Too close to "I moan".
---Heheh. Someone's a Baldur's Gate fan!
---It's pronounced "em-oh-en"?
Then, the question: how do you pronounce the name of Imoen?