Roger (/'r?d??r/, /'r??d??r/) is a masculine given name and a surname. The given name is derived from the Old French personal names Roger and Rogier. These names are of Germanic origin, derived from the elements hrod ("fame", "renown") and gar, ger ("spear", "lance"). The name was introduced into England by the Normans. In Normandy, the Frankish name had been reinforced by the Old Norse cognate Hróðgeirr. The name introduced into England replaced the Old English cognate Hroðgar. Roger became a very common given name during the Middle Ages. A variant form of the given name Roger is Rodger. The surname Roger is sometimes an Anglicised form of the Gaelic surname Mac Ruaidhrí. Roger is also a short version of the term "Jolly Roger", which refers to a black flag with white skull and crossbones, formerly used by sea pirates since as early as 1723. From c.?1650 to c.?1870, Roger was slang for the word "penis", probably due to the origin of the name involving fame with a spear. Subsequently, "to roger" became a slang verb form meaning "to have sex with", "to penetrate".