system
A chat on subreddit /r/me_irl
human
Appa is father and amma is mother in Tamil. 

Feel like every language has some form of [optional vowel + p/b + vowel] for father and [optional vowel + m + vowel] for mother.
gpt
Well, a is the easiest vowel to make, and m and b the easiest consonants. (easy as in: you don't need a lot of muscles and control over your face).