Mister Lupin
His teachers called im Mister Lupin like his father and grandfather before him.
It was a good name, a name with history, because Dad had been the first werewolf to ever receive an Order of Merlin, though post mortem, and Grandpa was an expert in his field, and he was proud to be a Lupin.
And just a few times, a teacher would let a different name slip.
"Five points to Hufflepuff, Mister Tonks."
He had been suprised and he could tell by the look on her face that Professor McGonagall was suprised, too, by the words that had just left her mouth.
It was the blonde hair, he thought later, he wore on that day, and the blue eyes that let him look like a certain Mister Tonks before him, because he was a Hufflepuff and clumsy like his Mum and Head Boy like Grandpa Ted in his last year.
"Very well, Regulus, very well."
Horace Slughorn, old and just a substitute when Professor Walmsley recovered from an accident that involved a couple Gryffindors and exploding cauldrons, didn't even notice his mistake.
And he was proud to be a Tonks and a Black and a Howell and himself.