Citer :
Nom qui serait la combinaison de Trismegiste (comme dans Hermès Trismegiste) et Tristan.
C'est ce que m'avait rapporté un professeur anglais de littérature anglaise (je n'ai pas lu le livre) Ce professeur citait les propos tenus dans le livre par le père du narrateur (donc votre professeur ne semble pas l'avoir lu non plus
).
Et c'est mentionné d'ailleurs dans la notice wiki du livre en anglais:
"Though Tristram is always present as narrator and commentator, the book contains little of his life, only the story of a trip through France and accounts of the four comical mishaps which shaped the course of his life from an early age:
One of his father's pet theories was that a large and attractive nose was important to a man making his way in life. In a difficult birth, Tristram's nose was crushed by Dr. Slop's forceps.
A second theory of his father was that a person's name exerted enormous influence over that person's nature and fortunes, with the worst possible name being Tristram. In view of the previous accidents, Tristram's father decreed that the boy would receive an especially auspicious name, Trismegistus. Susannah mangled the name in conveying it to the curate, and the child was christened Tristram.
According to his father's theory, his name, being a portmanteau-like conflation of "Trismegistus" (after the esoteric mystic Hermes Trismegistus) and "Tristan" (whose connotation bore the influence through folk etymology of Latin tristis, "sorrowful"), both doomed him to a life of woe and cursed him with the inability to comprehend the causes of his misfortune."