real name
Je connais pas son vrai nom, mais par ici, on l'appelle Grands-Pas.
I don't know his real name, but around here, we call him Bigfoot.
— Le Seigneur des anneaux : La Communauté de l'anneau (2001)
What is his real name?
Son vrai nom est Lisa.
Her real name is Lisa.
Don't use his real name.
Don't use his real name.
Je sais que son vrai nom n'est pas Tom.
I know that his real name isn't Tom.