It is likely this street name comes from the townland name which is Tullycarnet or in Irish: "Tulaigh Charnáin 'hillock of the little cairn’ ". (Placenamesni.org accessed: 5th May 2025). The translation of Ardcarn is "high cairn". A cairn is a human construction usually a pile or stack of stones used for different purposes such memorials or burial sites.