From the NYT:
Laura Arrillaga-Andreessen, with her husband, Marc Andreessen, the Netscape co-founder, says that she was drawn to philanthropy because of her mother's early death from cancer.
John Arrillaga, her real estate developer dad, is one of the two Spanish-surnamed people on the Forbes 400. His parents were Basques born in Spain. Last I checked, the other Spanish-surnamed billionaire is billboard king Arte Moreno, a genuine Mexican-American, who, as owner of the California Angels, is going to pay a quarter of a billion to slugger Albert Pujols.
Here's Razib on the distinctive Basque DNA
, although I must say that Ms. Arrillaga-Andreesen doesn't look too different from most rich men's wives / daughters.