Hi Nancy:
Better late than never; I just saw your message and in case you are still searching, here are some links.
Perhaps you’ll find your ggg grandfather here:
http://recherche.archivesdepartementales76.net/?id=recherche...=
Most French departments now have their archives online. See:
http://fr.geneawiki.com/index.php/Archives_en_ligneDieppe is in the Seine-Maritime department number 76. Click on Sites where you’ll find 5 collections online. Go to:
http://www.archivesdepartementales76.net/Click on Etat Civil
Click on Cliquez ici pour accéder à l’Etat Civil en ligne
Go to Dieppe - Of the 5 collections, 2 look interesting and they are from the parishes of Saint- Jacques and Saint-Remy.
Need more help? Let me know.
Good luck.
Lucie
P.S. For Ireland, FamilySearch.org has 13 collections:
https://familysearch.org/search/collection/list/?page=1&...