From the Hebrew name יָעֵל (Ya'el) meaning "ibex, mountain goat". This name appears in the Old Testament belonging to the wife of Heber the Kenite. After Sisera, the captain of the Canaanite army, was defeated in battle by Deborah and Barak he took refuge in Heber's tent. When he fell asleep Jael killed him by hammering a tent peg into his head.
German form of Iseult, appearing in the 13th-century German poem Tristan by Gottfried von Strassburg. In 1865 the German composer Richard Wagner debuted his popular opera Tristan und Isolde and also used the name for his first daughter.
From the Old English name Eadgyð, derived from the elements ead "wealth, fortune" and guð "battle". It was popular among Anglo-Saxon royalty, being borne for example by Saint Eadgyeth;, the daughter of King Edgar the Peaceful. It was also borne by the Anglo-Saxon wife of the Holy Roman Emperor Otto I. The name remained common after the Norman Conquest. It became rare after the 15th century, but was revived in the 19th century.