What's the function of "ann" here?
I suggest looking at this discussion: https://www.duolingo.com/comment/6278148
And why do we say cad is ainm duit but cad e do ghrad? Death by copula.
In cad is ainm duit, you have a relative clause. It's literally "What is it, that name to you". Cad é do ghrad doesn't have the relative clause.
In this case the Irish sentence makes more sense than the English sentence. The English sentence is just weird.