Etymology
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Rob Roy (n.)

Highland freebooter and folk hero, Robert Roy MacGregor (1671-1734). His name means "Red Robert." Scott's novel first was published in 1817. As a type of cocktail made with Scotch whiskey, it is attested from 1960.

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Hob 
c. 1300, Hobbe, a variant of Rob, diminutive of Robert (compare Hick for Richard, Hodge for Rodger, etc.). Also a generic proper name for one of the common class.
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Della Robbia (adj.)

1787, from name of a family of 15c. Florentine painters and sculptors; used of wares made by Luca Della Robbia (1400-1482), or those like them.

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Robert 

masc. proper name, from an Old North French form of Old High German Hrodberht "bright-fame, bright with glory," from hrod- "fame, glory" (from Proto-Germanic *hrothi-), + *berht "bright" (from PIE root *bhereg- "to shine; bright, white"). Never a king's name, though it was the name of William the Conqueror's rebellious oldest son. "It was introduced by Normans during the reign of Edward the Confessor and became very popular" ["Dictionary of English Surnames"].

In Middle English, from mid-13c., also "a designation for a robber, vagabond, or lowly person" ["Middle English Compendium"]; hence Robertes men "robbers, marauders;" Robert-renne-aboute "a wastrel, a good-for-nothing."

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Robin 

masc. proper name, from Old French Robin, diminutive of Robert (q.v.). Robin Goodfellow, "sportive elf or domestic fairy of the English countryside," said to be the offspring of King Oberon of Fairyland and a mortal, is attested by 1530s (Tyndale), popular 16-17c.; Robin Hood is from at least late 14c.

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Peter 

masc. proper name, 12c., from Old English Petrus (genitive Pet(e)res, dative Pet(e)re), from Latin Petrus, from Greek Petros, literally "stone, rock" (see petrous), a translation of Syriac kefa "stone" (Latinized as Cephas), the nickname Jesus gave to apostle Simon Bar-Jona (Matthew xvi.17), historically known as St. Peter, and consequently a popular name among Christians (Italian Pietro, Spanish and Portuguese Pedro, Old French Pierres, French Pierre, etc.). As slang for "penis," attested from 1902, probably from identity of first syllable.

The common form of this very common name in medieval England was Peres (Anglo-French Piers), hence surnames Pierce, Pearson, etc. Among the diminutive forms were Parkin and Perkin.

To rob Peter to pay Paul (1510s, attested in slightly different wordings from late 14c.) might be a reference to the many churches dedicated to those two saints, and have sprung from the fairly common practice of building or enriching one church with the ruins or revenues of another. But the alliterative pairing of the two names is attested from c. 1400 with no obvious connection to the saints:

Sum medicyne is for peter þat is not good for poul, for þe diuersite of complexioun. [Lanfranc's "Chirurgia Magna," English translation, c. 1400]
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