This might be the first name in this list who has you wanting to look her up on Google, so let us save you the bother. She's not as big a deal in terms of celebrity as the names we've looked at so far, but she's every bit as rich. British-born Petra Ecclestone is an heiress. She's like a British Paris Hilton, without the scandals.
Her father is Bernie Ecclestone, a billionaire who has served for years as the chief executive of Formula 1 motor racing, which is hugely popular around the world. Like her sister Tamara, who has a $300m fortune of her own, Ecclestone has done some modeling work but decided to move beyond that into fashion design. Having survived meningitis as a teenager, she's happy to campaign as an ambassador for the Meningitis Trust charity, so you can bet that at least some of her fortune is going to good causes.