Hi,
Family Tree Sources for their marriage in 1942 in Dublin South.
"Ireland Civil Registration Indexes, 1845-1958," database, FamilySearch (
https://familysearch.org/ark:/61903/1:1:FYKZ-RZ9 : 10 March 2018), MARRIAGES entry for Christopher Carroll; citing Dublin South, Oct - Dec 1942, vol. 2, p. 389, General Registry, Custom House, Dublin; FHL microfilm 101,578.
"Ireland Civil Registration Indexes, 1845-1958," database, FamilySearch (
https://familysearch.org/ark:/61903/1:1:FYK7-NTL : 10 March 2018), MARRIAGES entry for Margaret O'Rourke; citing Dublin South, Oct - Dec 1942, vol. 2, p. 389, General Registry, Custom House, Dublin; FHL microfilm 101,578.
You may be able to order the certificates to obtain their parents names if you are unable to find any further information for them.
regards
T