Seriously, all we know about the Vault 101 overseer in Fallout 3 is that his last name is Almodovar, since Amata's last name is Almodovar, and even that's sketchy because Amata might have taken her mother's maiden name instead of her father's name just for kicks and giggles.
So for the sake of simplicity, I'm just going to call him one of three things. Vladimir, Adolf, or George W. Almodovar Jr. It fits since he's kind of a fascist and puts the integrity of the vault itself above the safety of the residents, as is proven by the shooting deaths of Tom and Mary Holden when they approached the guards in front of the door leading to the vault door. If it was locked and needed the overseer's key to be opened, then why shoot people who approached instead of simply restraining or incapacitating them?
And by killing a married couple whom had no children, the genetic diversity of the future residents is further reduced. They may not be irradiated, but genetic diversity is more important unless you like genetic disorders running rampant in a few generations. Oftentimes genetic disorders can be more crippling than being irradiated, since they have magical items to reduce radiation levels known as "Rad-Away" and such.
Just like we call our leader the President--"President" is not a title, it's an office. It is incorrect to say "President Wiggles" or "President Fish" or "President Bob". It's just "the President".
Therefore it is incorrect to call The Overseer by anything else.
And of course that doesn't change the fact that he's contradicted many of his actions. If you read the medical records on James' terminal before the G.O.A.T. exam, it says that Overseer demanded to be within the room during Amata's examinations, apparently because he doesn't trust either her or James or both. This seems like natural paternal protective instinct, correct? But later during Escape he pretty much has Amata beaten by Officer Mack to get information about the Lone Wanderer out of her. That's putting the "safety" of the vault above the well-being of his own daughter. That and he had Jonas murdered too. That makes me want to kill him every time, but I want to be able to do Trouble on the Homefront later on for the XP and such.