certified letter

I received a notice that I have a certified letter that I personally 
need to sign for to receive. I cannot just sign for it and have the PO 
leave it for me.  I am working all day so it will be a difficult to 
receive it.  It is for a Dr. [my name].  in other words the name is 
correct but the prefix is Dr.  I am not a doctor, never have been.  The 
address is correct.  Of course I am concerned about why I would have a 
cert letter sent to me.  Can I even legally receive this letter since it 
is to a  someone that is not me?  or should I just forget about it?  I 
am curious.  If I forget about it and it is really for me can I get in 
more trouble for not receiving it [as far as I know I am not currently 
in any trouble]  I am thinking what if someone has used my name and 
address to do something nefarious.  For that reason alone I would like 
to know what it is all about.  But how could I even sign for it when I 
am not Dr. [my name]?  TIA