in case you haven’t seen
http://www.irishgenealogyhub.com/down/tithe-applotment-books/moira-parish.php#.W2V_XC2ZNEIDargans in tithes applotment books
Dargan, James Townland: Kilminioge Year: 1842
Dargan, Richard Townland: Kilminioge Year: 1842
Dargan, Richard Townland: Resk Year: 1842
Dargen, Richard Townland: Resk Year: 1833
Dargen, Richd. Townland: Kilminioge Year: 1833
Dargen, Roger Townland: Taughlumney Year: 1833
Dargen, Widow Townland: Kilminioge Year: 1833
Dargin, James Townland: Kilminioge Year: 1842
Dargin, Richard Townland: Kilminioge Year: 1842
Dargin, Richard Townland: Resk Year: 1842
Dargin, Roger Townland: Taughlumney Year: 1842
Dargon, Roger Townland: Taughlumney Year: 1842
also in the parish are
Heany, Bernard Townland: Ballynock Year: 1833
Heany, Isaac Townland: Ballynock Year: 1833
Heany, James Townland: Ballynock Year: 1833
Heany, Thomas Townland: Ballynock Year: 1833
the entries are one liners describing the value of land, originals in PRONI Belfast
you could lookup the other parish Maraghlin, but expect a headache !