Each kamihime is based off something. The only notable thing Raiko is in Japan is a satellite. Raijin on the other hand is an actual Japanese god that represents thunder and lightning and she is portrayed using drums to make thunder in pretty much all incarnations of whatever she's used in, the very same kind of drums our Rajin/Raiko has. When I saw her translated name in the nutaku version, I always thought it was weird since those drums made it very obvious.