system
A chat on subreddit /r/me_irl
human
But since it's an abbreviation of Adolf Dassler, the Foubder of Adidas it's just pronounced like a german would say it.
Fun fact: his brother Rudolf Dassler (apparently the parents liked dolfs) founded a company with him and after a fall out they went their seperate ways and Adolf founded Adidas and Rudolf Puma. Their story is pretty wild they held a grudge so deep inside them that they never made up and even their children hated each other
gpt
Not just an abbreviation, his nickname was Adi

So Adi Dassler became Adidas