Ada

(female) Of uncertain origin; it was not in general use before the late 18th century. It may be a Latinate variant of the biblical name Adah. However, it has also been explained as a pet form of Adele and Adelaide, Germanic female names of which the first element is adal ‘noble’. It was borne by a 7th-century abbess of Saint-Julien-des-Prés at Le Mans.