It makes perfect sense, seeing that all other members of Thursday's immediate family are named after days of the week. Her mother is Wednesday, her daughter and son are Tuesday and Friday, respectively, and she herself is Thursday. The only name / day not taken is Monday. * No, there's still room for a Saturday Next and a Sunday Next. Though Saturday is an extremely awkward name... * Completely unrelated, but the HR lady where this troper works is actually named Saturday.