John O'Hara b. 1846 Ireland, came to CT 1868

hello - I am looking for information on birthplace and/or anything else for my great-grandfather, John O'Hara.We know he came to the US in about 1868, married a woman named Mary in CT in 1870, and settled in Derby, CT, where they had 13 children: William (1871), Edward (Edwin)(1873), Catherine (Kittie)(1875), John J (~1876), Marie (Mary)(~1879), Charles R (1880), George (1882), Elizabeth (1884), Francis A (1886), Robert Henry (1888), and Joseph P (1890).

Anyone have any connection to this O'Hara clan?

Thanks, Elise Martin