Given Names

No, is the answer.
Later they may have used their Confirmation name. A second name that was give at their birth.
Margot

To add to what Margot said:

Irish names were often Latinized (or pseudo-Latinized) in baptismal records, or replaced with some sort of Biblical or other Classical name that the priest thought appropriate, though the name might never be used again by the family.  An "anglicized" form of the Irish name might then later be used, and sometimes it was swapped even later for another name they liked better, especially on emigrating.  A boy named Donncha might be baptized as Dionysius, and later might be called Donagh, Denis, Duncan or something else.  A boy named Tadhg might be baptized as Timotheus or Thaddeus, and later become Timothy, Thaddeus, Thady, or Thomas (my great-grandfather was called all of those names in different records).  For some people, the name chosen by the priest "took", which is why many boys named Conor ended up as Cornelius's.  A girl named Sadhbh, Sorcha, or Síle might be baptized as Sophia, Sarah, or Cecilia, and later either keep that name or become Sally, Sibby, Sabina, Sheila, Judith, Judy, Jude, or Julia.

Thanks so much for your reply. I have been trying to determine if two of my great-grandfather s brothers were actually one person who was baptized Patrick but was known as William