Rambo

Medieval German short form of masculine Ram- names of which the second element starts with b-, such as Rambald and Rambert.

Transferred use of the surname Rambo. However, in present day, due to the pop culture impact of the film series Rambo, starring Sylvester Stallone, Rambo has taken on a modern meaning of "one who is reckless, disregards orders, uses violence to solve all problems, and bravely charges headlong into the teeth of the enemy."

John Rambo is a fictional character played by American actor Sylvester Stallone, and the main protagonist of the 'Rambo' series of films. He first appeared in the 1972 novel First Blood by 'David Morrell'. The portrayal of the character earned Stallone widespread acclaim and recognition. The character was nominated for American Film Institute's list 100 Years…100 Heroes and Villains. The character had such an impact that his name, and its modern definition, have been added to the Oxford Dictionary.
David Morrell chose the name Rambo from a Swedish apple.