<Tr> <Th> Language (s) of origin </Th> <Td> Old Irish (Anglicized) </Td> </Tr> <Tr> <Th> Related names </Th> <Td> Caissie O'Casey O'Cathasaigh MacCasey O'Casaigh </Td> </Tr> <P> Casey is a common variation of the Irish Gaelic cathasaigh / cathaiseach, meaning vigilant or watchful . At least six different septs used this name, primarily in the Counties of Cork and Dublin . </P> <P> People with the surname Casey include: </P>

Where does the last name casey come from