Save Type Surname (from given name) Usage Scottish Meaning & HistoryExpand Links Anglicized form of MacFhionnlaigh. This name was borne by the American president William McKinley (1843-1901), who was assassinated. Related NamesDetails RootFionnlagh (given name)VariantsFindlay, Finlay, Finley, Kinley(Scottish) MacFhionnlaigh(Scottish Gaelic) Categories American presidential surnames, bandleaders, drummers, isograms