Q: When we are in Jannat, will we keep the same names as we have here on earth?
A: I vaguely recall reading something about this but can't remember exactly. Apparently, we will still maintain our same names as in this world, unless a person had an un-Islamic name, which will then change as Allah decides. What I remember also is that besides our birth names, people will be given titles according to their good a'maal.
Also, some will be allowed to pick far more better and beautiful names for themselves.
And Allah knows best.