Ok I found

Modifiying the CBauthentification.php, line 275 (CB.2.1.4), replaceByFormating the firstname as described above,
work for exemple with Jean-Marc De La Ménardière where De La Ménardière is only the lastname

Eric

Thanks for your workaround.

I developed a small cb plugin to avoid changes of names on joomla database. It works as described below:

1.- First login, first and last name is filled from ldap database (in my particular case all caps letters). Proceed to modify the First Name and Last Name on cb component to correct format.
2.- Second and following logins, joomla database is not changed and position of First and Last name mantain the desired format modified on step 1.

Do you need the plugin? or you solved the problem with your workaround...

Regards!

Thanks for proposing your plugin !
I'll not have the benefit of it as I need to update the field if anything change in A.Directory,
it work fine with my solution, just have to take care when updating CB.
Best