pdotb quoted Le Morte d'Arthur by Thomas Malory (Le Morte d'Arthur, #1)
Le Morte d'Arthur (originally spelled Le Morte Darthur, Middle French for "the death of Arthur"[1]) …
...and because thereof she commanded or she died that when I were christened they should christen me Tristram; and because I would not be known in this country I turned my name and let me call Tramtrist...
— Le Morte d'Arthur by Thomas Malory (Le Morte d'Arthur, #1) (62%)
A cunning plan that, remarkably, worked!