Where does “goupille” come from?

goupille (French) comes from French goupil, from Old French gulpil, from Vulgar Latin vulpiculus, from Latin vulpecula, from Latin vulpēs, from Latin volpēs, from Proto-Italic wolpis, from Proto-Indo-European h₂wl(o)p- — fox, jackal.

goupille (French): pin; cotter pin; first-person singular present...