Thank you for your very sound advice.
I have already uploaded to gedmatch - haven't heard of ftnda - but I get overwhelmed at all the technical stuff and really don't how to translate it.
Because so many records prior to 1800 in Ireland are not available, it's been very difficult for me to suss out complete trees for family groups. Again, I'm working with such common names that search results turn up hundreds, sometimes thousands, of possibilities. There's no cross-reference.
At any rate, I'll plug along and do appreciate your suggestions.