Francis Cooney

hi trying to trace Francis Cooney born about 1840 - emigrated to sheffield area and in 1861 was a miner, married in 1864 fathers name is joseph Cooney. no record of where in ireland he came from and by 1881 census he says he is an accountant from sheffield which is not true - Cooney is not a common name in sheffield then - his wifes name of Platts is a very common Sheffield name.

Just wonder if anyone can give any clues as to where he came from in Ireland.