Pluto was named by an 11-year-old girl from England whose grandfather knew the professor of astronomy at Oxford. Venetia Phair (her married name) wasn’t too bothered when Pluto lost its planet designation, but she definitely did not like it when people assumed she named the planet after the Disney dog. Her grandfather’s brother had named the Mars moons Phobos and Deimos. Phair died on April 30th at the age of 90.