Sorry - just saw this post. It is interesting that you have a Timothy, since we have a census showing my great-grandfather Thomas (married to Lizzie Hurley) living next door to Timothy McCarthy in NYC. We have no evidence that they are related, but it has always seemed likely.
Thomas was the son of Daniel McCarthy and Nora Couglin. Daniel did rent land from Lord Bandon, but my grandfather believed the family was from Kinsale. Other than my grandfather's claims about names and residences I have not been able to find any other records for Daniel and Nora. I would love to learn more.