Rosemerta - first or last name

[B.G.]

No: HPFGUIDX 128645

Definitely Rosemerta is her first name and the students call her 
Madame Rosemerta out of respect for an adult.

This even more underlines the disrespect Harry has for Snape. Harry 
frequently refers to him as Snape and is constantly reminded by DD to 
use his title, Professor Snape.  DD demands respect for Snape from all 
most especially Harry.  I think DD knows that Harry needs Snape and 
must learn respect him even if he does not like him.

BG