Etymology
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Benjamin 
masc. proper name, in Old Testament, Jacob's youngest son (Genesis xxxv.18), from Hebrew Binyamin, literally "son of the south," though interpreted in Genesis as "son of the right hand," from ben "son of" + yamin "right hand," also "south" (in an East-oriented culture). Compare Arabic cognate yaman "right hand, right side, south;" yamana "he was happy," literally "he turned to the right."

The right was regarded as auspicious (see left and dexterity). Also see Yemen, southpaw, and compare deasil "rightwise, turned toward the right," from Gaelic deiseil "toward the south; toward the right," from deas "right, right-hand; south." Also compare Sanskrit dakshina "right; south," and Welsh go-gledd "north," literally "left."

In reference to a favorite younger son it is from the story of Jacob's family in Genesis. With familiar forms Benjy, Benny. Slang meaning "money" (by 1999) is from the portrait of Founding Father Benjamin Franklin on U.S. $100 bill. In some old uses in herb-lore, etc., it is a folk-etymology corruption of benzoin.
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Murphy 

common Irish surname, Gaelic Murchadh "sea-warrior." The Celtic "sea" element is also in names Muriel (q.v.), Murdoch (Old Irish Muireadhach, Old Welsh Mordoc "mariner"), etc. As colloquial for "a potato" by 1811, apparently in allusion ot it being a staple food of the Irish.

Murphy bed (1912; in full Murphy In-A-Dor Bed) is named for U.S. inventor William Lawrence Murphy (1876-1959). By happy coincidence, Murphy was an illiterate 18c.-19c. perversion of Morpheus, god of sleep. Murphy's law (1958) is used of various pessimistic aphorisms. If there ever was a real Murphy his identity is lost to history. Said to be military originally, and it probably pre-dates the earliest printed example (the 1958 citation calls it "an old military maxim").

No history of the subject would be complete without some reference to the semilegendary, almost anonymous Murphy (floreat circa 1940?) who chose to disguise his genius by stating a fundamental systems theorem in commonplace, almost pedestrian terminology. This law, known to schoolboys the world over as Jellybread always falls jelly-side down, is here restated in Murphy's own words, as it appears on the walls of most of the world's scientific laboratories:
If Anything Can Go Wrong, It Will.
[John Gall, "Systemantics," 1975]
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