MwRYum
Major
I admit when I typed that out, I was thinking more with the KanColle vibe, though IRL that still applies...I doubt it Kaga was an old Province name, Akagi is a name of a Plateau in line with the present DDG like Atago, Ashigara, Myoko,etc .
As for Zuikaku that is a name for a secret beast like Seiryu.
Kaku means Red-crowned crane, like Ryu another secret beast the Dragon.