Synola is in fact Alcheilla, the Queen of the Lance Shelled City, Glendan. She wanted to experience the life of an ordinary girl so she disguises herself as Synola. Kanaris, one of Grendan's 12 Heavens-Blade wielders, acts as her double and performs the role of Queen while she is away.
Although they look very much alike Synola (Acheilla) has green eyes while Kanaris has purple eyes.
The Chrome Shelled Regios artbook shows her given name to be written as Alcheilla.