The Latin form is Berengarius - compare the feminine equivalent, Berengaria.
Berengaria of Castile (Seville, 1253 - Guadalajara, 1300), was an infanta of Castile and Lady of Guadalajara in her own right.
The ships that feature in "The Million Dollar Bond Robbery" are changed from the Olympia and the Gigantic to the Queen Mary and the Berengaria.
When the daughter, Berengaria, of Alfonso X of Castile was betrothed to Louis, eldest son and heir of King Louis, Castile ceded the use of the ports of Fuenterrabía and San Sebastián to Navarre on 1 January 1256.