Hi Patricia
Try the 1911 and 1901 Census of Ireland. If you estimate he was in his 50s in 1941 then he would have been in his 20s at the 1911 Census. If you know his religion then exclude those that do not match because of profession or family this might reduce the number of potential matches to a reasonable number. Same with the 1901 census.

Link: http://www.census.nationalarchives.ie/search/

Jayne