Roger
mid 16th century: from the given name Roger . The verb (dating from the early 18th century) is from an obsolete noun sense ‘penis’.
wiktionary
From Roger, used circa 1940 in UK and US military communication to represent "R" when spelling out a word. "R" is the first letter in received, used to acknowledge understanding a message. "ROGER" for "received" in spoken usage in air traffic radio parlance by 1950.
Possibly from Old High German Hrotger via Shelta roger.
etymonline
Roger
masc. proper name, from Old French Rogier, from Old High German Hrotger, literally "famous with the spear," from hruod- "fame, glory" + ger "spear" (see gar (n.)). "The name was introduced from Norman where OG Rodger was reinforced by the cognate ON Hroðgeirr" [Dictionary of English Surnames]. Pet forms include Hodge and Dodge. As a generic name for "a person," attested from 1630s. In 16c.-17c. cant, "a goose." Slang meaning "penis" was popular c. 1650-c. 1870; hence the slang verb sense of "to copulate with (a woman)," which is attested from 1711.
The use of the word in radio communication to mean "yes, I understand" is attested from 1941, from the U.S. military phonetic alphabet word for the letter -R-, in this case an abbreviation for "received." It is said to have been used likewise by the R.A.F. since 1938. Roger de Coverley, once a favorite English country dance, is said to have been so called from 1685. Addison took him early 18c. as the name of a recurring character in the "Spectator."
THE first of our society is a gentleman of Worcestershire, of ancient descent, a baronet, his name Sir Roger de Coverley. His great-grandfather was inventor of that famous country-dance which is called after him. All who know that shire are very well acquainted with the parts and merits of Sir Roger. [Addison]
