Welcome to the problem of only knowing they were from Ireland
Unless you can determine whereabouts in Ireland they might have come from I'm afraid you might be stuck.
Have you tried the IGI to see whether they've transcribed the baptism or if you have an usual name or one that relates to only one or two places - then you might have a chance.
I've loads of lines going back but not a hope in **** of finding them unless I get a miracle.
Very few Catholic baptisms exist from that far back for any parish, may be more lucky if they were Protestants, I think some of their baptisms registers can go right back to the late 1600's.
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