In the ongoing Twisted Wonderland manga, all four prefects that we have seen thus far have had names connected to the afterlife:
Heartslabyul Arc, Enma Yuuken (円満 雄剣): Enma’s family name is pronounced the same (the kanji is different) as 閻魔 (Enma), the king of hell in Buddhism. From the Kyoto National Museum website: “The King of Buddhist Hell is Enma, who is also the judge of the afterlife.”
Savanaclaw Arc, Hirasaka Yuuka (比良坂 悠河): “Hirasaka” is written and pronounced the same as the hirasaka of Yomotsu-hira Saka, known as “The Entrance to the Underworld” in Shintoism, explained on Shimane Prefecture’s official tourism website: “Yomotsu-hira Saka appears as the boundary between the land of the dead and the land of the living.”
Octavinelle Arc, Mito Yuuta (三途 宥太): “Mito” uses the same kanji as 三途川, the “River of Three Crossings,” which is “a mythological river the souls of the deceased must cross by one of three crossing points.” Credit to blogger Tansho for the discovery that “River Styx” was changed to 三途川 in the Japanese-language dub of the “Hercules” TV show.
Scarabia Arc, Oujou Yuuna (逢生 結菜): Yuuna’s family name is pronounced the same (the kanji is different) as 往生 (oujou), a term in Japanese Buddhism for rebirth in the Pure Land. There is also 大往生 (dai-oujou), which means “peaceful death.”
An observation by an anonymous poster:
“If it goes Enma’s judgment → Sanzu River → Rebirth, then it kind of feels like they’re moving from the afterlife back toward the world of the living. Not that it means anything in particular, it’s just a baseless theory, haha.”
Twisted Wonderland Reference Note 