C___B___E___U__R___O__R___G___R__M__E___C___G = BRUCE McGREGOR

Bruce McGregor Davis?

There is no indication that Z had ever used anagramming. Anagramming is often thought to be useful when a desired solution actually does not match the cipher structure. In the end it’s not. Am quite sure that there could exist names matching the cipher structure although, after checking tens of thousands of real names, I could not find even one. ‘JOHN EVERETT JR’ was almost a match but in fact, because of one letter/symbol, was not.

Thus, if you find your name matching the cipher, you very well could be Z

Or Z used some different phrase instead of his name (e.g. ‘The red phantom’). But, then again, why would he / the author write "My name is" in front of it. Find a name matching, with e.g. ties to Z crime regions, and you’ll ne very close to Z..

QT

I think it translates to Doranchakwins..LOL

The Zodiac Killer wrote "signed yours truley" on the Exorcist letter and proceeded to give us a verse from ‘Tit-Willow’. It made me wonder whether he was hinting that his name was in the verse, such as "Will" or "Bill". Consequently "signed yours truley, William". Will appeared three times. The letter was a curious blend of ‘The Exorcist’ and ‘The Mikado’. Three prominent William’s were associated with these two productions, William S. Gilbert (responsible for the libretto of The Mikado), and William Friedkin and William Peter Blatty responsible for ‘The Exorcist’ film and book.

Bearing in mind the estimated age of the Zodiac given as between 25-45 in 1969, this would make his birth date between 1924 and 1944. So, from a statistical standpoint, I looked at the most popular boys names in the USA in the 1920s, 1930s and 1940s. William was ranked 4th highest in the 1920s with 512,400, 4th highest in the 1930s with 416,646 and 4th highest in the 1940s with 556,399.

I looked at the most popular American surnames that could possibly fit the criteria required by the ’13 Symbol’ cipher and the already inserted "William". Sixteenth on the list was the name Martin, giving us an estimated name of William Martin for the Zodiac Killer.

William Martin featured in the class of 1958 in the Vallejo School yearbook, meaning he was 26 years of age in 1968. But where did he live?

Years ago, before I knew there was a big online community, my best friend had told me about his grandfather being a cop or private investigator (or something like that) in the bay area during the Zodiac murders. His name was Bill Martin. I only met him once, around 2006 I think, and he was probably in his mid-late 70’s at the time. Unfortunately he passed away a couple years after I met him. He had a Zodiac suspect of his own and said he had a huge file on the guy, although I never got to see said file. The suspects name was either Robert or Richard Heller. I spent a good amount of time researching the names and never came up with much. It would be crazy if my friend’s grandfather was the same one you found in the yearbook.

EDIT: I don’t think the ages match up, unless my friend’s grandfather looked 10 years older than he was, which is possible.

It would certainly be interesting Ophion. William, with two double letters, certainly allows flexibility for an array of surnames in the ’13 Symbol’ cipher. But why would the author of the Exorcist letter effectively sign his name using a verse, if his name was not contained within it?

Gilbert & Sullivan – "My Name is John Wellington Wells". https://www.youtube.com/watch?v=5eVV259vYl4

Does a shortened version of this name fit the cipher?

But why would the author of the Exorcist letter effectively sign his name using a verse, if his name was not contained within it?

I do have a thought, in answer to your question. In quoting from the Mikado, Zodiac would expect the reader to either know, or be willing to research for clues, the rest of the aria in question. If the reader did so, he would find the character (Ko-Ko, I think) watching the bird die say:

Now I feel just as sure as I’m sure that my name
Isn’t Willow, titwillow, titwillow,…

Having got some sense of a degree of perversity, at times, in Zodiac’s communications, I suppose him to be saying something like:

Signed, yours truley: NOT Will…

Incidentally, while we’re all aware that Zodiac’s spelling errors are likely very deliberate – perhaps having some specific purpose at times – I have wondered about the fact that, in his version of the few lines from the Mikado in The Exorcist letter, he does misspell the bird’s name as ending in "willo," without the last ‘w’. And this – for whatever bizarre reason – brought to my mind "Will o" and on to "Will o’ the Wisp," which in the States equates to "Jack o’Lantern," which is also the name of the pumpkin added to the Halloween card sent to Avery. So maybe the intention in the Exorcist letter was to say:

Signed, yours truley: not Will, but JACK!

Jack Tarrance? Anyone? No?