I think this is the family you are looking for:
Patrick Butler/Mary Anne Allender had the following children in Kilrush:-Patrick 13/3/1866
Mary 20/1/1878 (twins)
Looks like he named his own children in line withe the ones above per the 1911 Census. Hope this helps you. The last of the Butlers of Kilrush (Paddy Butler) died about 2 weeks ago R.I.P.