NAMING: Variations of Given Name

In my research on Owen Beagan of Cavan I find Owen is often substituted by Euginus, which is Latin for the anglicized Eugene. The early Catholic registers, tolerated by the Church of Ireland, were not allowed to write in Gaelic (Owen = Eoghan , pronounced Oine).
Allen Temple Beagan
  beagan@capecod.net
http://members.tripod.com/~Al_Beagan/start.htm