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It's common knowledge that the word 'TeX' was inspired by the Greek word 'τεχ' pronounced "tech".

Just for satisfying my curiosity, anyone knows from where comes the letters 'La' in LaTeX?

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7  
Leslie Lamport :) –  cmhughes Jul 20 '12 at 22:17
    
related: tex.stackexchange.com/questions/49/… –  Count Zero Jul 20 '12 at 22:20
    
Welcome to TeX.SE. –  Peter Grill Jul 20 '12 at 22:22
    
This might look obvious, especially to mother-tongue English speakers, but I think we should mention it anyway: the name is (also) a pun with the English word latex. –  Federico Poloni Jan 23 at 0:29
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2 Answers

The word "LaTeX" is an abbreviation of "Lamport TeX", named after Leslie Lamport. With LaTeX Lamport added a collection of macros to the original TeX program by Donald Knuth.

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I've always heard so and, in fact, I've always consider this to be the origin of the "La", but I've never seen an official source in which this is documented (by Lamport himself preferably). Do you happen to have such a source? –  Gonzalo Medina Jul 20 '12 at 22:27
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Unfortunately, no. All I could find so far is an interview with Lamport by a German Mathematicians association (DMV) in which one question refers to that fact: research.microsoft.com/en-us/um/people/lamport/pubs/… –  SFAB Jul 21 '12 at 6:50
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One possibility is that LA means (Logic of Actions) since that Lamport developed the Temporal Logic of Actions and the corresponding TLATex typeset system.

http://research.microsoft.com/en-us/um/people/lamport/tla/tlatex.html

However it's a pity that Lamport himself does not satisfy our curiosity.

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2  
Later Additions-TeX :P –  percusse Jan 22 at 19:03
    
@zedobone i have a feeling that lamport himself isn't a terribly forthcoming person; in my time in this lab i've known a couple of people "working with" him, and indeed i've worked on a book which iirc had him listed as co-author. (once upon a time, we had m$ research as next-door neighbour of our lab, and i think i've worked at a desk this >> << close to his, but in different buildings.) –  wasteofspace Jan 22 at 20:27
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