Palmitic acid is called like that because it was first isolated in palm oil but it's naturally occurring in animal fat and breast milk because it's naturally produced by them.

Its not they are adding palm oil to butter and ghee, it's the because palmitic acid is not unique to palm oil (well some unscrupulous producer do adulterate ghee with palm oil but let's not go there yet what I'm saying apply to pure ghee)

https://www.researchgate.net/figure/Fatty-acid-profiles-of-g... 16:0 is the acid you're looking for.