Hi,
Drumnaveil is in the Maudabawn area between Shercock and Cootehill. There are still Crossans in the area. Judging by the census there were a number of families. As you are coming shortly the quickest way to see if you can track living families would be to use the phone book. I used eircomphonebook.ie and looked up residential & found one with the spelling Crossan, so you could ring that number and see if they can give you any directions or suggestions. Drumgoon would be the parish, it is a rural area, however they have a grat community spirit and they are very helpful & welcoming. There is a facebook page for Drumgoon Hill Old Graveyard https://www.facebook.com/Drumgoon-Hill-Old-Graveyard-1648727305436507/ you could send them a message and see what they can find for you. You could also contact the local priests and ask them to put a message in the church newsletters, with your contact details. I could not find their email address, but their contact details are as follows:
Very Rev. John Cooney PP VF
Address: Parochial House Station Rd , Cootehill, Co. Cavan
Phone: 0035349 5552163
Rev. Michael Gilsenan SSCC, CC
Address: Parochial House Maudabawn, Cootehill, Co. Cavan
Best of luck with your search.
Regards Carmel O'Callaghan