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| Mac Thomáis | Very rare: Dublin. Ir.Lang. See Mac Comish. |
| Mac Thomáis | Thomas: cuíosach líonmhar: Oir-dheisceart, Gaillimh-Maigh Eo. Sloinne uile-ghabhálach - ní bhaineann le clann faoi leith. Bhí sé i bhfeidhm sa mheán-aois mar ainm sinseartha. |
| Thoma | rare: Kenmare (Kerry). Polish, 20 cent. |
| Thomas | numerous: Ulster generally, South East, Mayo-Galway. Usually of fairly recent immigration from England or Wales. |
Parishes where Thomas and a second surname are both baptised.
This list shows total Thomas Roman Catholic baptisms by county.
Click on the county to see detail.