Miller/O'Niell

Can you give us a bit more information please? Both names are very common. (Over 2200 people named O’Neill and 581 named Miller in the Belfast area in the 1901 census). Roughly when did they marry and what denomination were they?

The period that your family were born and married is long before the start of statutory birth, death & marriage registration in Ireland (sometimes called Vital Records) which largely started in 1864. Prior to that you usually have to rely on church records. Not all churches have records for that period and of those that do not all are on-line.

You didn’t say what denomination your family were.  If RC, some of the churches in Belfast have records for the years you need. The RC parish for Ballymena (Kirkinriola) doesn’t have any records before 1848, so any RC baptisms there for this family won’t be recorded. The Belfast RC parish records are on-line free on the National Library site:

https://www.nli.ie/en/family-history-introduction.aspx

If the family were another denomination, then you probably need to search the church records in PRONI to see if you can find them. Those records are mostly not on-line and so a personal visit is required to view them.

I searched for the family on rootsireland but did not find them. That indicates the records are either not yet on-line or they attended churches whose records are lost or were never kept.

 

 

RC means Roman Catholic.