We don't have synonyms for bertin yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are berlin, berain and bertie.
(N) :
Bertin (615 – c. 709 AD), also known as Saint Bertin the Great, was the Frankish abbot of a monastery in Saint-Omer later named the Abbey of Saint Bertin after him.
(N) :
(c. 615 – c. 709) the Frankish abbot of a monastery in Saint-Omer who is venerated as a saint by the Catholic and Orthodox Churches.
(N) :
Bertin (615 – c. 709 AD), also known as Saint Bertin the Great, was the Frankish abbot of a monastery in Saint-Omer later named the Abbey of Saint Bertin after him.
(N) :
(c. 615 – c. 709) the Frankish abbot of a monastery in Saint-Omer who is venerated as a saint by the Catholic and Orthodox Churches.