'Erin Go Bragh' is seen everywhere in US, but few Irish-Americans know how to either say it or what it means. It supposedly was a battle cry of one of the Irish Regiments and was probably originally an approximation of 'Éirann go Brách' which is not correct Irish for 'Ireland Forever' either, which would be 'Éire go Brách', but Erin has become an accepted Anglicized version, especially in the US, for Éire, which fewer here could ever pronounce confidently. BTW very few mottos, as seen on coats of arms, etc. are in correct or proper Latin, French or whatever, e.g. 'Honi soi qui mal y pense'.