The main difference between Roger and Rodger is that the Roger is a male given name and Rodger is a family name.
Roger 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 hrōd, χrōþi (“fame”, “renown”) and gār, gēr (“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.
Rodger is a surname, and is a variant of Roger as a first name and may refer to:
Received used in radio communications to acknowledge that a message has been received and understood
“1950: “Pilot: CESSNA TWO THREE FOUR—ROGER—OUT.” Flying Magazine, May 1950, [https://books.google.ch/books?id=bJ1HBQf26b0C&pg=PA46 p. 46].”
Of a man, to have sexual intercourse with (someone), especially in a rough manner.
To have sexual intercourse.
your message has been received (used in radio communication)
“‘Roger; we’ll be with you in about ten minutes.’”
used to express assent or understanding
“‘Go light the stove.’ ‘Roger, Mister Bossman,’ Frank replied”
(of a man) have sexual intercourse with.