Procter & Gamble is suing a start-up personal care company over a brand name. P&G took offense to Willa, which it claims is too close to its Wella brand. But Christy Prunier, the founder of the brand, which includes lip balms, facial masks and lotions that are available in Target, J. Crew and other retailers, is fighting back. Prunier told The New York Times that she named the line after her daughter, Willa, and spent nearly three years working with chemists and dermatologists to cr...