TC, the names started turning sour since Black and White...seriously, where've you been?
Black and White fit the Yin-Yang theme.
The Japanese logos for X and Y have DNA helixes on them, suggesting a DNA theme, and that the games are named after the X and Y sex chromosomes.
Boo! I thought it was very clever being the first 3d game boy pokemon to be called X Y and future possibility Z after the axes of a coordinate plane. :( --- Gamertag: Mr Anarchy Duck Currently Playing: Halo 4, Halo Wars, Borderlands 2, Forza 4/Horizon