Treasa is a rare Irish female given name of uncertain origin, possibly derived from the Irish word "treas," meaning "strong" or "victorious." It has been used in Ireland since at least the 17th century and was borne by notable figures like Treasa de Marisco, a 14th-century Irish noblewoman known for her bravery and intelligence. Today, Treasa is still occasionally used and associated with qualities such as strength, courage, and resilience.