Quote from Lorelai in Introducing Lorelai Planetarium
Rory: Hey, you didn't take Dad's name, did you?
Lorelai: No. No. "Hayden"? No. I don't want to be Mrs. Hayden planetarium for the rest of my life. I'm Lorelai Gilmore, okay? Lorelai Gilmore without the "Gilmore" is like Gil, you know, less.