Hi could someone translate peter & kelly lydon to is proper gaelic spelling Thanks

Peter Lydon would be spelled Peadar Ó Loideáin. In Irish Kelly is a sur-name not a given name The sur-name is spelled either Ó Ceallaigh or Mac Ceallaigh or in the case of a female Ní Ceallaigh or Nic Ceallaigh but that would not be transferable to a given name. The sur-name is a genitive form of an ancient Irish male name; probably Ceallach So, if Kelly is male then maybe Ceallach Ó/Mac Loideáin To decide which prefix Son/Grandson you would have to do some family geneology