"Jughead" seemed to imply that Richard, Widmore, and Ellie
Should I know "Ellie"?
Ellie is the blonde-haired Other in 1954 who takes Faraday to inspect the nuke. She is also mentioned in "Whatever Happened, Happened":
Faraday says that there's something familiar about her, and everyone presumes that Ellie = Eloise Hawking, Faraday's mother, as the names are similar and the ages would work out.