Edgar's Name page says: 
"Selina is an Anglicized form of the French Celine, short for Marcelline, a feminine form of Marcel, the French form of Marcullus, an elaboration of Marcus, from Marticos, which probably refers to Mars, the Roman god of war.
Selina is also an alternate spelling of the name Selena. Selena is the Latin form of a Greek name, Selene, meaning “Moon.” It was another name for the Greek goddess Artemis." (Vaudree (talk) 00:00, November 18, 2015 (UTC))