You should be looking at the original surnames as Gaeilge/in Irish! The travellers had their own version of course but if they are Irish travellers and not gypsies then there should not be 'j,k,q,w,x,y,z' in the original name. E.g. king is normally mac an rí 'son of the King', Burke is 'de burca'. You should understand that names were anglofied and letters like v came from 'bh' etc. if you don't bother to look up the Irish alphabet then all this is is a guessing game.