To be honest, I only see
Alexandria as an unnecessary elaboration of
Alexandra. It has many nicknames, though:
Alex,
Lexi, Sandria, Dria,
Lex, etc. The only real association I have with it besides
Alexandra is the Egyptian town, which I guess isn’t too bad.
For the most part, though, I’ve never cared for this name. To me, it’s just
Alexandra with an “i”.