Runa

There is a character named Runa in the popular anime 'Kakegurui'.

Runa Akasaka is a Japanese actress who is best known for her appearances in adult videos (AV). Akasaka's career in AV lasted about four years, with 70 to 100 videos listed for her at two major retailers at the end of 2008. Asasaka has also starred in titles in the pink film and V-Cinema genres.

There's a really eerie children's book called Runa about a Swedish girl who is apparently destined to die because of her place in her family. (Thankfully, she eventually overcomes this fate and lives to see her next birthday!) However, the book really isn't very well known, and the name is quite lovely if you think about it, so I have decided that I like it!