Jack the Ripper...?

Question

If they never knew who he was...Why did they know his name was Jack ?

Answer 1

The above answers have the simple, 'Sunday-schooled' version of the origin of the name; half correct.
I shall answer this best I can, keep in mind that am I one of many Ripperologists.

The first written reference which uses the name "Jack the Ripper" in reference to the Whitechapel murderer was found in a letter sent to the Central News Agency on September 27th, 1888. This letter later came to be known as the 'Dear Boss' letter, this letter was originally believed to be just another hoax. Three days later, the double murder of Stride and Eddowes made them reconsider, especially once they learned a portion of the latter's earlobe was found cut off from the body, eerily reminiscent of a promise made within the letter. The police deemed the "Dear Boss" letter important enough to reproduce in newspapers and post bills of the time, hoping someone would recognize the handwriting.
That explains the media's part in portraying the name.
The letter reads as following;

"Dear Boss,
I keep on hearing the police have caught me but they wont fix me just yet. I have laughed when they look so clever and talk about being on the right track. That joke about Leather Apron gave me real fits. I am down on whores and I shant quit ripping them till I do get buckled. Grand work the last job was. I gave the lady no time to squeal. How can they catch me now. I love my work and want to start again. You will soon hear of me with my funny little games. I saved some of the proper red stuff in a ginger beer bottle over the last job to write with but it went thick like glue and I cant use it. Red ink is fit enough I hope ha. ha. The next job I do I shall clip the ladys ears off and send to the police officers just for jolly wouldn't you. Keep this letter back till I do a bit more work, then give it out straight. My knife's so nice and sharp I want to get to work right away if I get a chance. Good Luck.
"Yours truly
Jack the Ripper
Dont mind me giving the trade name"

However, this is not the last letter to be received that encloses with the name "Jack the Ripper", at least 4 others did, including the controversial 'Saucy Jack' postcard.

The authenticity of this letter is evident when the author mentions 'clipping' the ladies ear off, Jack's fourth victim, Catherine Eddowes had, in fact, had a piece of her ear cut off.
There are more clues in the letter, such as the usage of the word 'Clip' in the letter which has been debated as a possible clue to one of the suspects, a George Chapman a.k.a. Severin Antoniovich Klosowski, who was previously employed as a barber.
Another, more controversial clue is that the author mention 'Ginger beer bottles'; it is interesting to note that in the room of Jack's last victim, Mary Kelly, on the rooms inventory list was found that ginger beer bottles were found on the floor. This could, and I say this with uttermost caution,
that Mary's lover, Joseph Barnett could have been the Ripper.
But both of these clues are very questionable, so don't get too exited.

Hope this helps,
Cheers ;)

Answer 2

Jack was just a name given to the unknown killer by the press and people. The reason for this was because of a letter to the Central News Agency by someone claiming to be the murderer, probobly going by the name Jack. The letter was published in newspapers at the time and people started calling the unknown psycho, Jack and Jack the Ripper, even though it was not highly believed that the author of this letter was the true serial killer.

Also, he left letters at his gruesome crime scenes. Sometimes they said Jack, and once he signed one as "Jack the ripper", or so I have heard, but I am not sure what is trie.
Hope this helped!

Answer 3

Jack the Ripper replaced right into a serial killer who murdered prostitutes in an impoverished part of england. To at present time he continues to be nameless, although there are various theories as to his id.

Answer 4

The media called him "Jack the Ripper" from a letter that was sent to London's Central News Agency claiming to be from the killer. The letter was later debunked as a hoax, but the name stuck.

Answer 5

It was a name that was signed on one of the letters that were sent to the police. A bunch of different letters were sent though , so people never knew if they were real or just people messing around.

Answer 6

It was Severin Antoniovich Klosowski hairdresser from Poland

Answer 7

Cos he left notes for the police.