I have a Mary Creevy who married John Maher around 1872 in Chicago. John was from County Westmeath and while looking for him, I found some Creevys in Westmeath. I believe it is the family you mentioned. I saw them in Griffiths Valuation. I don't have the material handy but I'll dig it up and write you back. Was one of your John Creevys' daughters named Mary?