Weird I got the same exact thing, it said Hola (Name)!!!, normally I dont reply back, but since it somehow knew my name I replied saying who is this and said that if I wanted to find out I would need to add them on Yahoo Messenger.
I just got the same message a few minutes ago! It's possible this person has hacked into a Yahoo database or something. I'm changing my password, just in case.
Got the same as all of you...trying to make sure my girlfriend doesnt think I got some psycho beeyotch trying to start crap...now Im glad to see Im not the only one