use of middlename in comprofiler

Hi,
I have noticed that middlename field is used in comprofiler when I update a field  in community builder, user management.
For example user "chantal NGHIEM VAN tri" : "chantal" is in firstname, "NGHIEM VAN" is in middlename and "TRI" is in lastname
How make in order to have "NGHIEM VAN TRI" in lastname ?
thank you for your response

 

Change "Name Style" in CB > Configuration > General if you want users to be able to supply their first, middle, and last name explicitly otherwise CB is left to guess. If using "Single Name Field" you can basically just ignore how it's stored in the database as the name splitting won't be relevant anywhere.