I know someone named
Tamara but we call her Tammy...some nicknames aren't bad, like
Rosalind to
Rosie, or
Micheal to
Mike.
You're not changing it though. I think that you are just shortening it to make it easier, or recognize if someone else has that name.
“It is better to be hated for what you are than to be loved for what you are not.” -
Andre Gide