Further, Rava’s permissive stance…had a Zoroastrian demonological belief at its base, as did the Bavli’s suggestion that nail parings should be buried (B. Moed Katan 18a). (Cambridge Companion to the Talmud and Rabbinic Literature, page 173)Now, I'm fairly careful about the inyanim around trimming one's nails. Nevertheless I can see how the practice seems a little atypical compared to most Jewish practices. But say what you will about Chazal/Gedolim being influenced by their environment, I'm not one who is inclined to assume that they adopted non-Jewish practices outright.
It is true, of course, that the result of secular research and study will not always coincide with the truths of Judaism, for the simple reason that they do not proceed from the axiomatic premises of Jewish truth.” (Torah Im Derech Eretz, Rabbi Samson Raphael Hirsch zt’l, page 415).