Argentina: First Name or Title?
From ExecutivePlanet.com
First Name or Title?
Addressing others with respect
Address people by using the titles Señor [Mr], Señora [Mrs], Señorita [Miss] followed by surnames.
Physicians and lawyers are addressed as 'doctor' followed by surnames.
<google>WIKI</google>
When a woman marries she adds her husband's surname preceded by 'de' but keeps her father's surname: Julia Pérez de Larrea.
'Tuteo' [calling people 'che'o 'vos' instead of 'usted' when addressing people] comes after some period of mutual trust and friendship.

