No more than changing a dog's name is bad luck.
The horse my mom used to have, came with the registered name Bruno Bar Love. I believe he was originally called Bruno in one home, Moe in another, and finally Malcolm (which is what she changed it to).
We have also had dogs that came with stupid names. Our now deceased dog Sparky came with the name Bubba. My Sheltie named Frodo, started off with the name Alan (yes, Alan).