Calling all my Techie Friends

An unusual problem has arisen and I don't quite know how to deal with it.

On Tuesday, 06/21, I began receiving email for a Catherine Connelly at my gmail address. They are legitimate correspondence, not spam. Tuesday, I received her lab results from a physician's office, and today, I received a car rental reservation confirmation from National Rental.

Since I attempt to be responsible when/if a situation calls for it, I hit reply, stated my identity and that I did not know the intended recipient.

Now, here is the part that makes no sense. My gmail address has been my gmail address since May 2006, because there are messages with that date stamp in the archive.

How did this Catherine Connelly register for a gmail account with MY address?

I checked the knowledge base at GMail and even posted a query at their support forum, but no none has replied yet.

GMail doesn't have a "contact us" address or telephone number.

Another thing niggling at me: Is this Catherine Connelly receiving my email?

*weary sigh*

Please, give me something else stupid to worry about - I have nothing better to do!