Why names and dates don’t match – and what to do
If Granny is ‘Bridget’ on one document and ‘Delia’ on another, you’re not doing anything wrong. This happens all the time in Irish records.
Common reasons
- Spelling wasn’t fixed. Clerks wrote what they heard. Kelly, Kelley and O’Kelly can all be the same family.
- The ‘O’ and ‘Mac’ came and went. Many families dropped them in the 1700s–1800s and some added them back around 1900.
- Irish and English versions. A name might appear in Irish in one record and English in another.
- Nicknames. Delia for Bridget, Johanna and Hannah, Honora and Nora, Jeremiah and Diarmuid.
- Ages were guesses. Ages in the census and on death or emigration records are often several years out.
- Birthdays differ. A late registration, or a baptism date used as a birth date, can shift things by days or weeks.
How to search around it
- Search a range of years (±3 to 5).
- Use wildcards where a site allows them (e.g.
Kel*). - Search by the parents’ names and the place, not just the person.
- Write down each document and what it says, side by side. Patterns appear.
For official applications, small differences are common, but bigger conflicts (different parents, very different dates) may need explaining. Check the official guidance on ireland.ie, and if documents seriously conflict, talk to a professional genealogist or a solicitor.