Elliot Handler

The L.A. penthouse once owned by the founders of Mattel -- and the makers of Barbie -- is hitting the market for someone else to live and play inside ... and it's going for a bundle. The 3-bed, 3-bath condo in the luxurious Century Towers is about to list for just under $10 million after having…

Elliot Handler -- a co-founder of the Mattel toy company -- the guy who NAMED the "Barbie Doll" -- has died ... TMZ has learned. Handler's caretaker tells TMZ ... Elliot had a medical emergency last night ... and eventually died from heart failure. Elliot's wife CREATED the Barbie Doll back in the…