Isabeau

Isabeau is a medieval French elaboration of Isabel, itself a medieval Spanish and Portuguese form of Elisabeth, which traces back through Latin and Greek to the Hebrew name Elisheba, meaning something like my God is an oath or my God is abundance. The name was borne by Isabeau of Bavaria, the influential and controversial queen consort of France as wife of Charles VI in the late fourteenth and early fifteenth centuries, which helped establish the name's historical profile. It has remained rare but has seen some modern revival, particularly in French-speaking regions and the Netherlands. Isabel, Isabella, Elizabeth, and Elspeth are among its many related forms across different languages.