Where does “ard-vullagh” come from?

ard-vullagh (Manx) comes from Manx mullagh, from Old Irish mullach, from Old Irish -lach.

ard-vullagh (Manx): pinnacle

Definitions

Step	Language	Word	Meaning
1	Manx	mullagh	roof; summit
2	Old Irish	mullach	top
3	Old Irish	-lach	—

ard-vullagh — Etymology, Origin & Word History | Etymology Explorer