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Why is Robert called Bob and John called Jack sometimes? What is the history of or reason for this practice in changing the English names of people?

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This is not limited to English, by the way. Ever wondered where Sasha comes from? That's a Slavic diminutive of Alexander (an even more obscure one is Shura). Speaking about Russian specifically, Grusha is the diminutive of Agrippina; Kostya of Konstantin; Misha of Mikhail; Nadya of Nadeshda; Kolya of Nikolai; Ksyusha of Ksenia; Masha of Maria or Marianne; Lyowa of Leo; Dasha of Darya; Zhenya of Evgeni; Pasha or Pavlik of Pavel; Senya of Arseni; Seryozha of Sergei; Asya or Nastya of Anastasia; Volodya of Vladimir; etc. – RegDwighт Jan 14 '11 at 9:58
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He did not reject a million. Nobody sent it to him and he did not send it back. He rejected the intrusion into his life and making a show from it – Gennady-Vanin-Novosibirsk Mar 5 '11 at 19:19
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My mind has been blown. Jack is the pet name for John?! Like, I could call John Lennon "Jack" and he'd know I was talking to him? Jack Lennon, it just sounds wrong :) And Jack Shepard vs John Locke, just thinking about calling John Locke "Jack" makes my brain hurt :) – Cyril Sep 26 '11 at 10:43
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@Cyril John Lennon probably wouldn't answer to Jack. My name is John, and I wouldn't answer to Jack. But, it wouldn't be unusual for people to begin calling a John "Jack" early in their life, and then it would stick. Also sometimes people find themselves stuck with a name they don't want. My friend James didn't correct people when they called him Jim, so he is stuck with it. – slim Jan 16 '12 at 14:25
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John F. Kennedy was known as "Jack" sometimes. Confusingly, he married Jacqueline, sometimes called "Jackie"... – GEdgar Jan 16 '12 at 16:29
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3 Answers

up vote 16 down vote accepted

This is called Hypocorism.

A hypocorism is a shorter form of a word or given name, for example, when used in more intimate situations as a nickname or term of endearment.

English forms nicknames in a variety of manners. Shortening, often to the first syllable:

  • Abraham → Abe
  • Anthony → Tony
  • Benjamin, Benedict → Ben, Benny
  • Carolyn → Carol, Lyn, Carrie/Cary
  • Christopher → Chris, Criffer, Topher
  • Deborah → Deb, Debby
  • Elizabeth → Eliza, Libby, Liz, Lizzy, Lisa, Beth, Bess
  • Fiona → Fi
  • Gregory → Greg
  • Jacob → Jake
  • Jonathan → Jon, John, Nathan
  • Joseph → Joe, Joey
  • Katherine → Kate, Katy, Kathy
  • Katrina → Kat, Trina
  • Matthew → Matt
  • Megan → Meg
  • Nathan, Nathaniel → Nat, Nate
  • Peter → Pete, Petey
  • Priscilla → Cilla, Priss, Cilly, Prissy
  • Raymond → Ray
  • Robert → Rob, Bert, Bob
  • Samuel, Samantha → Sam, Sammy
  • Stephanie → Steph, Annie, Stephy
  • Victoria → Tori, Vick, Vicky
  • Zachary → Zach

Addition of the diminutive suffix, usually -ie or -y. It is often added to the end of an already shortened name. This suffix connotes smallness or endearment. Although most often applied to the names of children, it is not uncommon for an adult to be referred to by the diminutive, especially by family, friends and close acquaintances:

  • Alexander, Alexandra → Sandy
  • Anne → Annie
  • Arthur, Arturo → Art → Artie
  • Andrew → Andy → Drew
  • Barnaby → Barney
  • Daniel → Dan → Danny
  • David → Dave → Davy
  • Dennis → Denny
  • Edwin, Edward, Edmund → Ed → Eddie, Eddy
  • Elaine → Lainie
  • Franklin→ Frank → Frankie
  • George → Georgie
  • Isabella → Izzy
  • James → Jamie
  • Jessica → Jess → Jessie
  • Joel, Joseph → Joe → Joey
  • Jonathan → Jon, John → Jonnie, Johnnie, Johnny
  • Katherine → Katie
  • Kimberly → Kim → Kimmy
  • Kenneth → Ken → Kenny
  • Lawrence → Larry
  • Louis → Lou → Louie
  • Nicholas → Nick → Nicky
  • Oliver → Ollie
  • Ronald → Ron → Ronnie
  • Rosemary → Rose → Rosie/Rosy
  • Stephen → Steve → Stevie
  • Susan → Sue → Susie, Suzy
  • Thomas → Tom → Tommy
  • Timothy → Tim → Timmy
  • Tobias → Toby
  • William → Will, Bill, Willie, Willy, Billy

A short form that differs significantly from the name:

  • Barbara → Babs
  • Charles → Chuck → Chaz → Chicka
  • Dorothy → Dot, Dottie
  • Edward → Ted, Teddy (e.g. Edward "Ted" Kennedy)
  • Eleanor, Helen → Nell, Nellie
  • Elizabeth → Bess, Bessie
  • Gerald → Jerry
  • Henry → Hal, Hank, Harry
  • James → Jim → Jimbo, Jimmy
  • John → Jack
  • Katherine → Kitty
  • Margaret → Peggy, Peg, Meg
  • Philippa → Pippa, Pip or Pippy
  • Richard → Dick
  • Sarah → Sally
  • Theodore → Ted, Teddy
  • Virginia → Ginger, Ginny
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Any logic or rationale behind the last ones (that is, the ones which differ significantly from the original name)? Richard becoming Dick and Charles becoming Chuck is something that always confounds me. – Mamta Dalal Jan 14 '11 at 9:11
The name Richard is very old and its true origins may well be lost in the depths of time past. The name likely stems from Old English, since 'Ric' meant ruler and 'heard' meant hard. It is also feasible that with the advent of rhyming slang, Richard would be shortened to Rich and then to Rick and on to Dick. Much like William - Will - Bill. – Mehper C. Palavuzlar Jan 14 '11 at 9:22
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There is a noticeable tendency in English to substitute a plosive (stop consonant) for the initial consonant in forming pet-names: Dick, Bob, Bill, Peggy, Polly. I don't know why this might be, or whether it is seen in other languages. – Colin Fine Jan 14 '11 at 14:11
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Rick/Dick, Bob/Rob, Bill/Will, Polly/Molly are examples of rhyming nicknames, and they've been around in English since the 13th century. A much more obscure example of a "significantly different" nickname is Hudde (as in Hudson), which was used for Richard. – JPmiaou Mar 6 '11 at 5:48
Mary --> Molly is another confusing one. – Peter Shor Jul 22 '11 at 11:34
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Elizabeth - Liz, Lizzie, Beth, Betty

Patricia - Tricia, Trish

Michael - Mike, Mikey

Robert - Rob, Bob, Bobby

Jacob - Jake

William - Will, Bill, Billy

Katherine - Kate, Kathy, Katy, Kat

Caitlin - Kate (and all the assorted spellings: Cait, Kate, Kait, Cate, etc)

Jennifer - Jen/Jenn, Jenny, Jenna

Pamela - Pam, Pammy

Tamara - Tammy

Christina/Christine - Christy, Chrissy, Chris

Jillian - Jill

Allison - Alli/Alley/Ali

Megan - Meg

James - Jim

Debra - Deb, Debbie

Jessica - Jess, Jessie

Danielle - Dani

Angela - Angie, Ang

Katrina - Trina

Nicole - Nicky

Nicholas - Nick

Samuel - Sam, Sammy

Stephanie - Steph

Andrew - Andy, Drew

Amanda - Manda, Mandy

Joshua - Josh

Kimberly - Kim

Matthew - Matt

Jeffrey - Jeff

Joseph - Joe

Janet - Jan

Rebecca - Becka, Becky

Michelle - Shelly

Benjamin - Ben, Jamie

Joanna - Jo

Kristen - Krissy

Thomas - Tom, Tommy

Margaret - Maggie

(There are plenty more...these are just the ones that I saw while scrolling through my Facebook feed.)

Basically, nicknames are a (usually) shorter, more familiar form of a name, usually used by friends and family. Some people will ask you to call them a nickname - perhaps to differentiate from a relative with the same name, because they do not like their given name, because that is how people in your shared circle of acquaintances know them, or to indicate that they feel a sense of familiarity with you (for example: strangers, acquaintances, coworkers and the like call me Bridget, but my family often shortens my name to Bri [pronounced Bree] or Bridey [an Irish diminutive form of my name] or B, my gamer college friends call me Bizzit or Biz [a corruption of my name from a sleep-deprived late night of gaming that just sort of stuck], my boyfriend's brother calls me Bridgey because he thinks it's funny, another friend calls me Babs because those are my initials...)

While someone may think it's funny to call someone by a certain name (whether it's a given name or a diminutive form of their name that they dislike), it's usually best to ask if they would prefer a nickname before simply calling them by one, especially if you don't know someone very well. A more formal, conservative Michael may think you to be rude if you call him Mike (or god forbid, Mikey.) It's usually best to call someone by the name that they use to introduce themselves.

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Fun fact: a nickname comes from a misparsing of an ekename, where eke was a Middle English term for additional, also, or together. So saying a nickname is rather like saying a nothername. I've decided to bring the term ekename back, because it's cooler. Or hell, maybe I'll just use nothername. sigh – Jon Purdy Jan 14 '11 at 8:06
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There's also Kate (short for Bob) :-) en.wikipedia.org/wiki/Bob_%28Blackadder%29 – Steve Melnikoff Jan 14 '11 at 19:15

These are commonly referred to as nick-names. A nick-name is typically a shorter, more personal, and less formal version of someone's name. They are generally a shortened, but phonetically similar version of the original name. Many standard English names have garnered popular nick-names over the years. Some others:

Christopher -> Chris
Richard -> Dick, Rick
Charles -> Chuck, Charlie
Donald -> Don
Stephen -> Steve
Patrick -> Pat
Ronald -> Ron
Edward -> Ed

(being a guy, I'm more familiar with the male names, but there are many more for women as well)

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But that actor uses: Christopher -> Topher – GEdgar Sep 26 '11 at 11:43

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