Controversial Tarvunian scholar who posits the theory that Tarvu spent six or so weeks in the small Irish village of Tipperary.

In her book, The Tipperarian, she also claims that the Irish names Fitztarvu, Tarvanahan and O'Tarvughessy are directly descended from women Tarvu had affairs with during his stay.

O'Onnor is also an hermaphrodite, and has married her/himself in a special civil ceremony.