It's ah-GLAH-yah here (the last part is between yah and eeah), no idea about English. Generally I think that if you have to ask how to pronounce it, it's best not to use it.
The site says that
Aglaia is ə-GLAY-ə or ə-GLIE-ə in English.
This message was edited 2/12/2011, 3:09 AM