PS. Another name for a willow is the sallow tree. I think that’s a very old-fashioned word, though, however it connects to salix in Latin, helyg in Welsh and helyk in Cornish. You can often turn a Latin/Old Celtic/Gaulish “s” into an “h” and get the Brittonic word, an interpretation of the Gaulish Coligny calendar month Samonios would perhaps correspond to the summer month if we apply this rule – haf in Welsh and hav in Cornish. The word “willow” if Germanic, but I think it goes back to a root for that which “turns” or perhaps that which “sees”. I think there was an old folk belief that willows could stalk and hunt people at night too, although I must say I don’t where that may have come from!