Of Scottish origin but now widely used in the English-speaking world. It is derived from a topographic term denoting a narrow strait or channel and in part is a transferred use of the surname, a local name from the region in Ayrshire so called. As a girl's name it appears to have been largely superseded by Kyla.
German: 1. from a short form of a German personal name composed with a cognte of Old High German ōt, Old Saxon ōel ‘possession’, ‘wealth’. 2. possibly a shortening of any of numerous German compound names such as Oppenberg, Oppendinger, or Oppenhäuser.