Rosa is the Latin word for "rose" — and the original form from which the English Rose derives. It has been used as a girl's name across the Catholic world for centuries.
Rosa Parks (1913-2005), whose refusal to give up her bus seat in Montgomery, Alabama on December 1, 1955 helped launch the American civil rights movement, gave the name its modern moral weight. Today Rosa sits in the U.S. top 500.
Rosa reduces to one — the number of singular bloom.