BTW, I see you are interested in this. Right now I am involved in one
conversation about "a" and "h". A lot of basic communication style,
not-yet-words, but more expressing different emotions or just some basic
vocal communication revolves around "a" and "h". "Ah, "ha", huh!",
"huh?" (the same thing only the pitch is different), "a-ha", pitch goes
up when you make a question, and goes down for answer, or exclamation
(see the first video below). "H" i produced by 'making sure lots of air
coming out of there' (as said in the second video below). I would
suggest that "ma" originates in "mah", "m" - holding your breath, "a" -
open mouth, "h" - 'making sure lots of air coming out of there' (see the
third video below). This situation is when you dive for shellfish (the
only meat a primate can eat raw, and it is already salty in sea), and
then you dive out:
https://youtu.be/KcXcby5pE34?si=bKiPs9god62sB4Lq
https://youtu.be/SeRLq5KJ_Ig?si=5nJcEbJtLe_XRCIM
https://youtu.be/dGtUoJJfi5o?si=t9Y88QjoFsxGq8hp