That is so weird. Kaia is not a popular name by far and has different meanings depending on where you look ("by the sea", "pure", and "earth" among others). I think they have the same father; the other male used was r/w with r/w parents and grandparents. Of course we have to wait for the DNA results, but if Jasper is the sire then they are half-sisters with the same name!
Still would be related back there if Drummer, but how interesting that would be if they have the same Dad… and the same name... WOW..