Well... I chose Felis, since it's a nice easily recognisable cat name, but the Harlequin came out of a twisted sense of irony...
My great...great.. ... Okay I'm not sure how far back - the family tree is my mother's hobby, not mine - grandfather was a nice Italian bloke by the name of Joseph Grimaldi. Also known as Joey the Clown. The first clown, in fact. And it was his style of entertainment that pretty much killed the Harlequins off as a profession.
Also, Harlequin sounds slightly cooler than Clownblood.