Just realised something tho...
Heng'e (姮娥) is the Moon goddess who was originally in China. She was the wife of Houyi (2100 BC), who shot 9 sons of the Heavenly King to save the Earth from burning. (The last son is now the Sun) Heng'e later drank the Immortal Elixir and flied onto the Moon. Unable to return, she stayed there and became its goddess.
The funny thing is, here, her name contains the word 姮 means Heng'e herself, but sounds the same as 恆 : always, eternal.
The other word, 娥, means beautiful girl, the moon. Both of them was usually compared to a jewelry, especially the Moon in poetry.
"The Moon shines like a jade." They said.
So I combine those words and look at what I found: Eternal Beautiful Jewel. And bash me if I'm wrong, but that's the name of our doctor: Eirin.