Irish records aren't the greatest but have had a look and the best I can see is 3 records in County Antrim
one for K. neil & 2 for K. O'neil and these are for 1920. No marriages shown and a note "there are not many records after 1920".
Your best bet is to write to or phone the Irish version of the G.R.O, address : General Register Office, Government Offices, Convent Road, Roscommon. Tel: +353 (0) 90 6632900 and ask their advice. Sorry I can't help you further