<P> 2,095,788 individuals (21% of the population) bear the most common 20 names, and 3,347,493 individuals (33.5%) bearing the top 100 names . </P> <P> The prevalence of some of these names is the result of more than one distinct Irish language names being represented by the same anglicised version . </P> <Table> <Tr> <Th> #</Th> <Th> Surname </Th> <Th> Modern Irish </Th> <Th> Original Irish </Th> <Th> Meaning </Th> </Tr> <Tr> <Td> </Td> <Td> Murphy </Td> <Td> Ó Murchú </Td> <Td> Ó Murchadha Mac Murchaidh </Td> <Td> Descendant of Murchadh (a personal name meaning "Sea hound / warrior") </Td> </Tr> <Tr> <Td> </Td> <Td> (O') Kelly </Td> <Td_colspan="2"> Ó Ceallaigh </Td> <Td> Descendant of Ceallach ("strife") </Td> </Tr> <Tr> <Td> </Td> <Td> (O') Sullivan </Td> <Td_colspan="2"> Ó Súilleabháin </Td> <Td> Descendant of Súilleabhán ("dark - eyed one", "one - eyed" or "hawk - eyed") </Td> </Tr> <Tr> <Td> </Td> <Td> Walsh </Td> <Td> Breathnach </Td> <Td> Breatnach </Td> <Td> "Breton", "Welshman" </Td> </Tr> <Tr> <Td> 5 </Td> <Td> Smith </Td> <Td_colspan="2"> Mac Gabhann </Td> <Td> Son of a smith </Td> </Tr> <Tr> <Td> 6 </Td> <Td> O'Brien </Td> <Td_colspan="2"> Ó Briain </Td> <Td> Descendant of Brian </Td> </Tr> <Tr> <Td> 7 </Td> <Td> (O') Byrne </Td> <Td_colspan="2"> Ó Broin </Td> <Td> Descendant of Bran </Td> </Tr> <Tr> <Td> 8 </Td> <Td> (O') Ryan </Td> <Td> Ó Riain </Td> <Td> Ó Riain Ó Maoilriain Ó Ruaidhín </Td> <Td> Descendant of Rian (possibly meaning "king") Descendant of Maoilriaghan ("bald king") Descendant of Ruaidhín ("little red - haired one") </Td> </Tr> <Tr> <Td> 9 </Td> <Td> O'Connor </Td> <Td_colspan="2"> Ó Conchobhair </Td> <Td> Descendant of Conchobhar ("hound / chief assistance") </Td> </Tr> <Tr> <Td> 10 </Td> <Td> O'Neill </Td> <Td_colspan="2"> Ó Néill </Td> <Td> Descendant of Niall (possibly meaning "cloud", "passionate" or "champion") </Td> </Tr> <Tr> <Td> 11 </Td> <Td> (O') Reilly </Td> <Td_colspan="2"> Ó Raghallaigh </Td> <Td> Descendant of Raghallach </Td> </Tr> <Tr> <Td> 12 </Td> <Td> Doyle </Td> <Td_colspan="2"> Ó Dubhghaill </Td> <Td> Descendant of Dubhghall ("dark - haired foreigner") </Td> </Tr> <Tr> <Td> 13 </Td> <Td> McCarthy </Td> <Td_colspan="2"> Mac Cárthaigh </Td> <Td> Son of Cárthach ("loving") </Td> </Tr> <Tr> <Td> 14 </Td> <Td> (O') Gallagher </Td> <Td> Ó Gallchóir </Td> <Td> Ó Gallchobhair </Td> <Td> Descendant of Gallchobhar ("foreign assistance") </Td> </Tr> <Tr> <Td> 15 </Td> <Td> (O') Doherty </Td> <Td_colspan="2"> Ó Dochartaigh </Td> <Td> Descendant of Dochartach ("hurtful") </Td> </Tr> <Tr> <Td> 16 </Td> <Td> Kennedy </Td> <Td> Ó Cinnéide </Td> <Td> Ó Ceannéidigh </Td> <Td> Descendant of Cinnéide ("ugly head") </Td> </Tr> <Tr> <Td> 17 </Td> <Td> Lynch </Td> <Td_colspan="2"> Ó Loingsigh </Td> <Td> Descendant of Loingseach ("longboat") </Td> </Tr> <Tr> <Td> 18 </Td> <Td> Murray </Td> <Td> Ó Muireadhaigh </Td> <Td> Mac Muireadhaigh Mac Giolla Mhuire </Td> <Td> Descendant of Muireadhach ("chieftain") Descendant of a servant of Mary </Td> </Tr> <Tr> <Td> 19 </Td> <Td> (O') Quinn </Td> <Td_colspan="2"> Ó Cuinn / Coinne </Td> <Td> Descendant of Conn ("hound / chief") </Td> </Tr> <Tr> <Td> 20 </Td> <Td> (O') Moore </Td> <Td_colspan="2"> Ó Mórdha </Td> <Td> Descendant of Mórdha ("majestic") </Td> </Tr> </Table> <Tr> <Th> #</Th> <Th> Surname </Th> <Th> Modern Irish </Th> <Th> Original Irish </Th> <Th> Meaning </Th> </Tr>

What is the most common last name in ireland