The Office...

Everyday at the office one of the guys here at Regal Energy walks past my desk and says,

"Good morning Allison", so confidently assured that that is my name.

I never introduced myself as Allison, I've never been called Allison, and I certainly am not an Allison. I haven't corrected him yet because he walks past my desk before I can get a word in. However it is only getting worse. It seems he wants to utter the name, "Allison" whenever he walks by me now, even if he's just making a comment about the weather. For example:

"It's a beautiful day out there Allison."

"Enjoy your weekend Allison."

"I'm leaving now Allison." etc. etc.

Whatever put the notion into his head that my name is Allison? And how can I put a stop to something that is already snow-balling out of control? To correct him now would seem...cruel.