I personally wouldn't, but don't think its bad luck or anything.
Last year when I was looking for a second horse (for my bf to ride), we were considering a nice gelding. His name? Al.
We both thought the name was funny, bf wanted to change it, but I said no, he probably knew his name.
Long story short, we didn't buy him, bf couldn't reconcile the fact of having a horse named Al.
We bought a Gunner instead. Lol.