Tristan

Though Tristan was the male figure in the romantic legend and his name has become trendy for boys, it's used now for girls, too: About 15 percent of the baby Tristans are female. And about three times as many girls are named Tristan as are named Isolde, Tristan's mythical female counterpart. There are also feminizations of Tristan, such as Tristana and Tristine, but these are much more rare than the original.