Hi, I have all the St Mullins baptisms transcribed and looked for your Thomas Doyle and wife Ellen. As you didn't give Ellen's maiden name, these may be the family you seek. I checked from 1825-1863 and came up with the following;
Baptisms:
2 April 1831 Catherine p.Thomas Doyle-Eleanora Connors
22 Dec 1833 John p.Thomas Doyle-Ellin Connor
8 April 1836 Simon p. Thomas & Ellen Doyle
18 August 1838 James p.Thomas Doyle-Ellen Connell (this appears to be priest error)
11 Nov 1840 Michael p.Thomas Doyle-Elen Connor
9 June 1843 Thomas p.Thomas Doyle- Ellin Connors
3 Sept 1846 Mary p.Tom Doyle- Ellen Connor
11 June 1848 Laurence p.Tom Doyle- Ellen Connory
*note with this entry: married to Anne Rourke at Drummond by me on 30 Nov 1891
23 May 1851 Owen p.Thomas Doyle- Ellen Connor
This is the only Thomas Doyle I found in the St Mullins parish registers married to an Eleanor/Ellen. There are other Thomas Doyles (actually
married to different women during this time period. There are many Doyles in St Mullins during this time period. I also found a Simon Doyle who was married to Bridget Kelly with children in St Mullins during this time. As Simon is a very infrequently used name, more than likely he is a brother or cousin to your Thomas. Hope this helps,Kim