@Martinw:  The characters are, I'm pretty sure, meant to be Japanese - Japanese uses a lot of Chinese characters (called kanji) to spell its words along with its own native alphabet.  Aiko is inspired by Japanese animation, so that's why they use a name from Japan (see my post above).  Still, it's interesting to see the Chinese pronunciation!  And "ko" is a common ending to female names in Japanese.  My mother and aunts all have names ending in -ko:  Hiroko, Nagako, Itoko, Sumiko, and none of them are children any more . . .

Edited because I misread the Chinese pronunciation Martinw offered.