Yes. At least twice.
one is a cat pun and the other is so fitting and unusual word that i absolutely refuse to change XD
The "pun" i found as some mini, not-so-serious comic on Facebook. Last update was many years ago, and the premise and tone is absolutely nothing like what my story is about, so i'm not bothered by it at all.
The other one though, i found it was registered on Smackjeeves also many years ago with no update or description or anything. It was where i wanted to share my work at first. I wasn't bothered by the similar title, but i WANTED the domain name LOL XD i actually contacted the web owner about it and to my surprise, they totally gave me the domain D : and i am yet to make any use of it haha orzz...