Hi Faoltrim,
I have already given you directions by pm (sorry for getting my road numbers mixed up....Esker/Lucan is, of course, off the N4 and not the N11). I shall give the directions here in case others may be interested, although I think the cemetery is closed to the public.
Easiest to get there on foot from the two cemeteries at Esker that are familiar to most people living in the area. Just keep walking past the two cemeteries and you will come to a footbridge crossing the N4. Far side of the footbridge, a very short walk past the junction for Esker Lane you will see the ruined church and small cemetery on your left.
To get there by car travelling on the N4 from Dublin:
Take the Adamstown/Lucan exit (sliproad off the N4). Stay on that road until you come to the roundabout at Superquin shopping centre. Turn left (first exit) off the roundabout and continue on that road until you come to a T junction. Turn left at the T junction and continue on that road until you come to another T junction. You will see the ruined church and cemetery facing you at that junction.
I don't know who holds the burial records (if there are any) for that cemetery, but people whose ancestors lived in the area before the newer cemeteries were opened may well have relatives buried there. The church dates back to at least the time of King John but I don't think there is any written evidence of an abbey having been there when the church was in use so I have amended my previous post, replacing the word "abbey" with "mediaeval".
Another two old burial grounds in Lucan that I'm aware of: one of them was behind Lucan RC church but the graves are beneath the modern extension to the church and the gravestones are displayed around the perimeter of the carpark; the other, very old cemetery is located in Lucan village behind the pubs and shops that face on to the little park in the centre of the village. There is no public access to the cemetery in the village.