Where does “filliud” come from?

filliud (Old Irish) comes from Old Irish fillid, from Proto-Celtic *welnīti, from Proto-Indo-European wēlH-, from Proto-Indo-European welH- — to turn, to wind.

Ancestry of “filliud”, step by step

Step	Language	Word	Meaning
1	Old Irish	fillid	turns back
2	Proto-Celtic	*welnīti	—
3	Proto-Indo-European	wēlH-	to roll, to undulate
4	Proto-Indo-European	welH-	to turn, to wind

Words derived from “filliud”

filleadh

Every word from Proto-Indo-European welH- →Every word from Proto-Indo-European wēlH- →Every word from Proto-Celtic *welnīti →