Internal Perspective...
   My standing observation of the use of the H graphme has been based on the frequencey of the H when transliterated from Arabic into Romaji scripts.
   There are about 14-or-so individually recognized pronunciations that are transliterated from the Arabic into the Romaji H.
   The same could be true of most Yazirian languages, many individually recognized phonmens could be finding representation in romaji transliteration, with a few number of graphemes.

On the track of the (external sources of the) phonetics themselves....
The phonetic clusters are varied, and I can find them most easily in; Arabic, Armenian, Balinese, Chinese, Hindu, Indonesian, Javanese, Russian, Sanskrit, Turkish.... geographic pattern seems to be...

East Europenean, Northern Middle-east, Western Asia, South Pacific...... rugged mountainous, arid steppes, canyons, jungles and the archipelago.

I don't think any of that looks coincidental.

In the way of atempts at translations....
I have tracked the name Grana Garu before, and found it in meanning Green River (from external perspective)... with the Garu for a refrence to the Garu Get, also known as the Akhurian River. I would (internally) translate that from Yazi to suggest a meaning roughly of, Green River or of a meaning similar to the meaning in Eden or Paradise, and steming from the high hopes the Yazi have had toward terraforming the planet there.

   In the name Yazirian itself , the -ian is a commonly used latinization for ethnic grouping, and would have been added by Pan-Gal traders in the same tradition of using that suffix on earth. The root includes <Yaz> and <ir> and is likely condensed forms of the Yazi words for their main cultural identity.

   The Yangtze River in China seems to be a very appropriate (external) influence here.. squishing Yangtze to Yazi and ir from river... and it becomes Ya'(ng.t)ze (riv.)er People or in a more litteral Yellow River People. I would point out that this region has some very appropreate legends of flying monkey people also. Where they were not unlike the Yazierian in form or society, and lived in the large forests and high deep caves along the river.

  As a reasonable (internal) translation from the Yazi languages of Yahng Tzeir, might carry a meaning of something like Genisis of Elevations, Young Horizons, or New Beginings..... People of the New Era World.

[edits included for clarity] I hope I didn't confuse too many people by switching back and forth, between retrofitting internal continuity in the Yazirian con-langing, with my show of the external artistic sources used. My appologies for that inconvienance if that was unclear. I feel that both views are equally valid in any attempt to include a meaning to the somewhat mashed phonetic clusters, that have been acumulated by multiple authors using divergent methods.
I am offering another piece of the language for consideration. I recognize that it is largely a matter of speculation in any attempt to ret-con Yazri linguistics, and like those ret-con-langers of Tolkeen or Lovecraft, the attempt is likely full of controversial opinions, and unsuportable facts.

I really like jedion's offered phonetics, the voiced bilabial trill or linguolabial trill, and the very unusual open-aspirated-voiced-labio-velar-stop, that appear to have been taken directly from the animal sound forms. The first could be easily transliterated as <b>, <b'>, <b'b>, <bb>, <p>, <bp>, <pb>, <pbt>.
The woop is possibly a cause of further confusion with the abundance of the <H> found in the transliterated examples, and the uses of <W> in unusual locations, and even as <ll>, or simply transliterated as <woo>, <vof>, <woof>, and <woef> in some cases.
Additional phonemes could be common in the Yazi languages, taken from the chatter, gibber, and whoop, catagories.

I also like the phoneme drawn from the use of a flapping patagium, the number of possible transliterations of this are incredibly diverse, and no doubt leads to even more problems in learning the language. I would however limit such non-vocal phonems from common use as phonemical building blocks, in the Yazirian languages.

Oh humans!!  We discover a galactic community filled with multiple species of aliens, and the first thing we think about is "how can we have sex with them?".
~ anymoose, somewhere on the net...

so...
if you square a square it becomes a cube...
if you square a cube does it become an octoid?