The emperor: Akihito
The empress:
Michiko
The crown prince: Naruhito
The crown princess: Masako
Their daughter:
Aiko
The emperor's second son: Akishino
His wife: Kiko
Their daughters: Mako and Kako
The emperor's daughter: Sayako
Does it not seem like every female name MUST end in -ko?
"You may give them your love but not your thoughts. For they have their own thoughts.
You may house their bodies but not their souls,
For their souls dwell in the house of tomorrow, which you cannot visit, not even in your dreams."
(On Children by Kahlil Gibran)