All goyim had holidays on Sunday which is for the god Sun (the Shamash of the heavens and Son of all powers). Gm avoda zara first perek. the Christians moved sabath to sunday to appease the goyim.
The original girsa was like maharsha, “gelilim”, but later ppl changed to notzrim cuz they thought the censors changed, but didnt. thats why we have it.