I’m surprised I didn’t as well.  We even have an unofficial example from Hamlet:

   'ej, pIvmo', wovqu'taHvIS wuqbogh qab,

    'oH ropmoH rIntaH Sotbogh qech ghom Hurgh.

   "And thus the native hue of resolution

    Is sicklied o'er with the pale cast of thought."
      [TKH, Hamlet’s soliloquy (Act III Scene 1?)]

GORKON: You have never experienced Shakespeare until you have read
                   him in the original Klingon.  [ST6: The Undiscovered Country]

--
Voragh, Ca'Non Master of the Klingons

From: tlhIngan-Hol <tlhingan-hol-bounces@lists.kli.org> On Behalf Of De'vID

On Tue, 13 Apr 2021 at 17:52, Steven Boozer <sboozer@uchicago.edu> wrote:

Klingon word:    Sotlaw'
Part of speech: noun
Definition:      distress call
_______________________________________________

PUN:    "shout loud"?

SEE ALSO:
ghum            [sound an] alarm (v)
QaH             help,  aid (v)
rIS              make a cracking/snapping sound; signal, emit a signal (v)

Se'              frequency (n)
   rI'Se'               hailing frequency (n)
   'evnagh Se'     subspace radio (n)
ghum           alarm (n)
rISwI'          transponder (sonar) (n)
HablI'          data transceiving device (n)
QumwI'  communicator (n)
chaDvay'      radio frequency (n)
wab HevwI'    radio (n) (TNK)
wab labwI'      radio service, broadcaster, radio transmitter (n)

I'm surprised you didn't mention the verb {Sot}: "be distressed, be in distress". 

Folk etymology: I imagine that when Klingons started signalling for help, whomever saw the signals said {Sotlaw'} "he/she is/they are apparently in distress", and over time, this expression became frozen as a noun referring to the signal itself.