1-I notice that there are alot of Irish names in english people like Bradley,Foley,Connors.....extra ,Now My question is why there are alot of irish names in english people? Is this because of norman invasion or not?I mean before norman invasion ,Were there lots of irish names in english people as much as modern days?

2-Which countries in modern days that were under roman empire? Was belgium (including flander part) under the roman controll?

3-Which countries in northern and western europe which that never been conquered by romans?