My earliest Comerford ancestor I have pinned down in James Comerford who was born in Ireland and came to Liverpool and had largish family, who themselves went on to have largish families, so there are quite a few of us out there.
I wrote a bit on the family here:
http://boards.ancestry.com/surnames.comerford/275/mb.ashx
We know from James' wedding certificate that his father was Patrick.
I thought I'd tracked down the family in Castlecomer, Kilkenny where a Patrick Comerford married a Jane McEvoy and had a son James who was baptised on 6 May 1832. However, someone seems to have thoroughly researched this family and James never left Ireland:
http://boards.ancestry.co.uk/localities.britisles.ireland.kik.gener...
Recently we have been contacted by someone who matches our autosomal DNA, as a 5th to remote cousin and they have an ancestor Bridget Comerford who married in Callan, County Kilkenny in 1835. This puts her in the same generation as Patrick and suggests they could have been brother/sister or first/second cousins. It also might help us pin down where the family came from. There is, for example, a James Comerford baptised in Callan on 24 Jun 1838, whose parents were Patrick Comerford and Margaret Shea. The date is a little late (our James 67 when he died in 1900, which is consistent with his census results), but it is a start.
I've added my autosomal DNA at FTDNA (where I tested), Gedmatch and DNA.land, so if you've already tested you'll find if we match in one of those places.