I agree, but a glance at names on the old photos of graduating classes reveals that while some families had generation after generation of Toms, Patricks, Michaels, Martins and Johns and lots of William Patricks in families with identifiable Irish surnames, others had names of the decade Marvin, Floyd, Gary. The first Kevin made his appearance in the late 50s, when Irish-Americans first stopped trying to seem Anglo and the Kennedys geared up to run for the presidency.
Girls' names like Erin and Shannon appeared at that point too. In general girls' names on the old photos tended to be more fashionable and less classic lots of Myrtles and Mabels from the early years, followed by LaVernes and Joyces and Normas and then Donnas, Carolyns, Susans, Brendas, and on into the 70s. You can also see the influence of various Catholic cultures other than Irish all the way through Victor, Anthony, Frederick, Herman, Manuel.
The current student directory features names like Finnegan, Finley, Isobel, Carter, Miranda, Madison, Kyle, Mason, Brayden, Chloe, and Payton as well as Kevin and Liam (a relative newcomer to the US) and Marek, Weronika, Marco, Gianna -- Americans are using names from their immigrant cultures with much more confidence than they did in decades past, if the school directory is anything to go by. Plus old standbys like Grace and Rachel and Sarah, Tom, Jack, Michael, etc.
I often see hyphenated names pooh poohed here but they are very much alive and kicking in Europe and acceptable in RC culture generally.