Where does “gwyliad” come from?

gwyliad (Welsh) comes from Welsh gwylio, from Welsh gŵyl, from Middle Welsh gŵyl, from Proto-Celtic *weilos, from Proto-Indo-European wéy-, from Proto-Indo-European éǵh₂ — I.

gwyliad (Welsh): }} watching, guarding

Definitions

}} watching, guarding

Ancestry of “gwyliad”, step by step

Step	Language	Word	Meaning
1	Welsh	gwylio	to watch; to keep watch over, to observe
2	Welsh	gŵyl	vigil; holiday, festival, feast; holiday,...
3	Middle Welsh	gŵyl	—
4	Proto-Celtic	*weilos	modest
5	Proto-Indo-European	wéy-	—
6	Proto-Indo-European	éǵh₂	I

Words derived from “gwyliad”

gwyliadwr
gwyliadwriaeth
gwyliadwrus

Every word from Proto-Indo-European éǵh₂ →Every word from Proto-Indo-European wéy- →Every word from Proto-Celtic *weilos →