It is a male given name borrowed from a surname. The name is of Anglo-Norman and French origin but is still today quite uncertain about etymology. Beaufort is the name of a noble family of 14th and 15th-century England, descended from John of Gaunt, 1st Duke of Lancaster. The name Beaufort refers to a castle in Champagne, France (now Montmorency-Beaufort), once the possession of John of Gaunt, 1st Duke of Lancaster, third son of King Edward III. The name seems to derive from the Old French “beau fortelesse,” from the Latin “bellus” (beautiful) plus “fortis / fortalitia” (courageous, energetic, tenacious, brave, bold, fearless/strong place, fortification).