The girls are named after and likely based on animals. Kuzuryu -> dragon, Takae -> eagle, Ushigome -> cow, Kodera -> tiger, Nekomiya -> cat, Itachi -> weasel, Shishidou -> lion, Kamogawa -> duck, Shiratori -> swan, Tsuruhashi -> crane, Kijitani -> pheasant, Inukai -> dog, Hibino -> baboon/monkey...