My son had an imaginary friend named Astra for about 2 years (age 3-4). She would come out at night to talk to him, and he said she was older and dead. She was always a friendly presence for my son. When she left he said that she “had to go be with another family” and she has never been back again. I recently looked up the name Astra out of curiosity because it was unusual and it means “celestial being.”