Funny difference I've noticed- in Australia, nearly every
Rebecca I know goes by Bec or Becks, but in the US
Becca and
Becky are used (which I've never heard used here).
I have two close friends in the US who are
Becca and
Becka respectively, and then I have about 6 or 7 relatively close friends named Bec in Australia but I have never met a single
Becca or
Becky. Your nickname opinions just reminded me of that.