That said, it would be difficult to come up with a good pun for "Acheron". Alternatively, she is Star Rail's incarnation of Raiden Mei/Ei, which has more potential: "Raiden" -> "riding", which could be used for something benign (e.g. "riding the Star Rail") or some form of sexual reference (e.g. "riding deez nuts", cf. post #5614078).